134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
/****************************************************************************
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* fs/fs_close.c
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*
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* Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 NuttX 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 <unistd.h>
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#include <sched.h>
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#include <errno.h>
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#include <nuttx/fs/fs.h>
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
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# include <nuttx/net/net.h>
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#endif
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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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/****************************************************************************
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* Function: close
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*
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* Description:
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* close() closes a file descriptor, so that it no longer refers to any
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* file and may be reused. Any record locks (see fcntl(2)) held on the file
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* it was associated with, and owned by the process, are removed (regardless
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* of the file descriptor that was used to obtain the lock).
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*
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* If fd is the last copy of a particular file descriptor the resources
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* associated with it are freed; if the descriptor was the last reference
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* to a file which has been removed using unlink(2) the file is deleted.
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*
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* Parameters:
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* fd file descriptor to close
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*
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* Returned Value:
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* 0 on success; -1 on error with errno set appropriately.
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*
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* Assumptions:
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*
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****************************************************************************/
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int close(int fd)
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{
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int err;
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#if CONFIG_NFILE_DESCRIPTORS > 0
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int ret;
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/* Did we get a valid file descriptor? */
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if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
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#endif
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{
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/* Close a socket descriptor */
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
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if ((unsigned int)fd < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS))
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{
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return net_close(fd);
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}
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else
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#endif
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{
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err = EBADF;
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goto errout;
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}
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}
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#if CONFIG_NFILE_DESCRIPTORS > 0
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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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ret = files_close(fd);
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if (ret < 0)
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{
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/* An error occurred while closing the driver */
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err = -ret;
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goto errout;
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}
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return OK;
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#endif
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errout:
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errno = err;
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return ERROR;
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}
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