3f1b80218e
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@107 42af7a65-404d-4744-a932-0658087f49c3
158 lines
4.3 KiB
C
158 lines
4.3 KiB
C
/************************************************************
|
|
* fs_open.c
|
|
*
|
|
* Copyright (C) 2007 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 Gregory Nutt 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 <sched.h>
|
|
#include <errno.h>
|
|
#ifdef CONFIG_FILE_MODE
|
|
#include <stdarg.h>
|
|
#endif
|
|
#include <nuttx/fs.h>
|
|
#include "fs_internal.h"
|
|
|
|
/************************************************************
|
|
* Private Functions
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Public Functions
|
|
************************************************************/
|
|
|
|
#if CONFIG_NFILE_DESCRIPTORS > 0
|
|
|
|
int inode_checkflags(FAR struct inode *inode, int oflags)
|
|
{
|
|
if (((oflags & O_RDOK) != 0 && !inode->i_ops->read) ||
|
|
((oflags & O_WROK) != 0 && !inode->i_ops->write))
|
|
{
|
|
*get_errno_ptr() = EACCES;
|
|
return ERROR;
|
|
}
|
|
else
|
|
{
|
|
return OK;
|
|
}
|
|
}
|
|
|
|
int open(const char *path, int oflags, ...)
|
|
{
|
|
struct filelist *list;
|
|
FAR struct inode *inode;
|
|
int status;
|
|
int fd;
|
|
|
|
/* Get the thread-specific file list */
|
|
|
|
list = sched_getfiles();
|
|
if (!list)
|
|
{
|
|
*get_errno_ptr() = EMFILE;
|
|
return ERROR;
|
|
}
|
|
|
|
#ifdef CONFIG_FILE_MODE
|
|
# warning "File creation not implemented"
|
|
mode_t mode = 0;
|
|
|
|
/* If the file is opened for creation, then get the mode bits */
|
|
|
|
if (oflags & (O_WRONLY|O_CREAT) != 0)
|
|
{
|
|
va_list ap;
|
|
va_start(ap, oflags);
|
|
mode = va_arg(ap, mode_t);
|
|
va_end(ap);
|
|
}
|
|
#endif
|
|
|
|
/* Get an inode for this file */
|
|
|
|
inode = inode_find(path);
|
|
if (!inode)
|
|
{
|
|
/* "O_CREAT is not set and the named file does not exist. Or,
|
|
* a directory component in pathname does not exist or is a
|
|
* dangling symbolic link.
|
|
*/
|
|
|
|
*get_errno_ptr() = ENOENT;
|
|
return ERROR;
|
|
}
|
|
|
|
/* Make sure that the inode supports the requested access */
|
|
|
|
if (inode_checkflags(inode, oflags) != OK)
|
|
{
|
|
inode_release(inode);
|
|
return ERROR;
|
|
}
|
|
|
|
/* Associate the inode with a file structure */
|
|
|
|
fd = files_allocate(inode, oflags, 0);
|
|
if (fd < 0)
|
|
{
|
|
inode_release(inode);
|
|
*get_errno_ptr() = EMFILE;
|
|
return ERROR;
|
|
}
|
|
|
|
/* Perform the driver open operation */
|
|
|
|
status = OK;
|
|
if (inode->i_ops && inode->i_ops->open)
|
|
{
|
|
status = inode->i_ops->open((FAR struct file*)&list->fl_files[fd]);
|
|
}
|
|
|
|
if (status != OK || !inode->i_ops)
|
|
{
|
|
files_release(fd);
|
|
inode_release(inode);
|
|
*get_errno_ptr() = ENODEV;
|
|
return ERROR;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
#endif /* CONFIG_NFILE_DESCRIPTORS */
|