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- /****************************************************************************
- * fs/vfs/fs_close.c
- *
- * Copyright (C) 2007-2009, 2012, 2016 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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 NuttX 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 COPYRIGHT HOLDERS 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
- * COPYRIGHT OWNER 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.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <unistd.h>
- #include <sched.h>
- #include <errno.h>
- #include <nuttx/cancelpt.h>
- #include <nuttx/fs/fs.h>
- #ifdef CONFIG_NET
- # include <nuttx/net/net.h>
- #endif
- #include "inode/inode.h"
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nx_close
- *
- * Description:
- * nx_close() is similar to the standard 'close' interface except that is
- * not a cancellation point and it does not modify the errno variable.
- *
- * nx_close() is an internal NuttX interface and should not be called from
- * applications.
- *
- * Returned Value:
- * The new file descriptor is returned on success; a negated errno value is
- * returned on any failure.
- *
- ****************************************************************************/
- int nx_close(int fd)
- {
- /* Did we get a valid file descriptor? */
- if (fd >= CONFIG_NFILE_DESCRIPTORS)
- {
- /* Close a socket descriptor */
- #ifdef CONFIG_NET
- if (fd < (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS))
- {
- return net_close(fd);
- }
- else
- #endif
- {
- return -EBADF;
- }
- }
- /* Close the driver or mountpoint. NOTES: (1) there is no
- * exclusion mechanism here, the driver or mountpoint must be
- * able to handle concurrent operations internally, (2) The driver
- * may have been opened numerous times (for different file
- * descriptors) and must also handle being closed numerous times.
- * (3) for the case of the mountpoint, we depend on the close
- * methods bing identical in signature and position in the operations
- * vtable.
- */
- return files_close(fd);
- }
- /****************************************************************************
- * Name: close
- *
- * Description:
- * close() closes a file descriptor, so that it no longer refers to any
- * file and may be reused. Any record locks (see fcntl(2)) held on the file
- * it was associated with, and owned by the process, are removed
- * (regardless of the file descriptor that was used to obtain the lock).
- *
- * If fd is the last copy of a particular file descriptor the resources
- * associated with it are freed; if the descriptor was the last reference
- * to a file which has been removed using unlink(2) the file is deleted.
- *
- * Input Parameters:
- * fd file descriptor to close
- *
- * Returned Value:
- * 0 on success; -1 on error with errno set appropriately.
- *
- * Assumptions:
- *
- ****************************************************************************/
- int close(int fd)
- {
- int ret;
- /* close() is a cancellation point */
- enter_cancellation_point();
- ret = nx_close(fd);
- if (ret < 0)
- {
- set_errno(-ret);
- ret = ERROR;
- }
- leave_cancellation_point();
- return ret;
- }
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