134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
/****************************************************************************
|
|
* fs/fs_close.c
|
|
*
|
|
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* 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 <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <sched.h>
|
|
#include <errno.h>
|
|
#include <nuttx/fs.h>
|
|
|
|
#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
|
|
# include <nuttx/net.h>
|
|
#endif
|
|
|
|
#include "fs_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Global Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: 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.
|
|
*
|
|
* Parameters:
|
|
* fd file descriptor to close
|
|
*
|
|
* Returned Value:
|
|
* 0 on success; -1 on error with errno set appropriately.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
int close(int fd)
|
|
{
|
|
int err;
|
|
#if CONFIG_NFILE_DESCRIPTORS > 0
|
|
int ret;
|
|
|
|
/* Did we get a valid file descriptor? */
|
|
|
|
if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
|
|
#endif
|
|
{
|
|
/* Close a socket descriptor */
|
|
|
|
#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
|
|
if ((unsigned int)fd < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS))
|
|
{
|
|
return net_close(fd);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
err = EBADF;
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
#if CONFIG_NFILE_DESCRIPTORS > 0
|
|
/* 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.
|
|
*/
|
|
|
|
ret = files_close(fd);
|
|
if (ret < 0)
|
|
{
|
|
/* An error occurred while closing the driver */
|
|
|
|
err = -ret;
|
|
goto errout;
|
|
}
|
|
return OK;
|
|
|
|
#endif
|
|
|
|
errout:
|
|
errno = err;
|
|
return ERROR;
|
|
}
|
|
|