a7fd58c4db
many locations: Change occurences of open() followed by file_detach() to file_open(). Change most non-controversion calls to open() to nx_open().
fs/inode/fs_fileopen.c: Flesh out file_open() with some interim, placeholder logic.
fs/inode/fs_fileopen.c: Add a framework for a file_open() implementation (no real logic in place yet).
fs/vfs/fs_open.c: Add nx_open() which is the same as open() except that it does not create a cancellation point nor does it modify the errno variable.
109 lines
3.7 KiB
C
109 lines
3.7 KiB
C
/****************************************************************************
|
|
* fs/inode/fs_fileopen.c
|
|
*
|
|
* Copyright (C) 2018 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 <sys/types.h>
|
|
#include <fcntl.h>
|
|
#include <stdarg.h>
|
|
|
|
#include <nuttx/fs/fs.h>
|
|
|
|
#include "inode/inode.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: file_open
|
|
*
|
|
* Description:
|
|
* file_open() is similar to the standard 'open' interface except that it
|
|
* returns an instance of 'struct file' rather than a file descriptor. It
|
|
* also is not a cancellation point and does not modify the errno variable.
|
|
*
|
|
* Input Parameters:
|
|
* filep - The caller provided location in which to return the 'struct
|
|
* file' instance.
|
|
* path - The full path to the file to be open.
|
|
* oflags - open flags
|
|
* ... - Variable number of arguments, may include 'mode_t mode'
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success. On failure, a negated errno value is
|
|
* returned.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int file_open(FAR struct file *filep, FAR const char *path, int oflags, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
int fd;
|
|
|
|
/* At present, this is just a placeholder. It is just a wrapper around
|
|
* nx_open() followed by a called to file_detach(). Ideally, this should
|
|
* a native open function that opens the VFS node directly without using
|
|
* any file descriptors.
|
|
*/
|
|
|
|
va_start(ap, oflags);
|
|
fd = nx_vopen(path, oflags, ap);
|
|
va_end(ap);
|
|
|
|
if (fd < 0)
|
|
{
|
|
return fd;
|
|
}
|
|
|
|
/* Detach the file structure from the file descriptor so that it can be
|
|
* used on any thread.
|
|
*/
|
|
|
|
ret = file_detach(fd, filep);
|
|
if (ret < 0)
|
|
{
|
|
(void)close(fd);
|
|
return ret;
|
|
}
|
|
|
|
return OK;
|
|
}
|