nuttx/fs/fs_dup.c
patacongo a60059d9d0 Finally, a clean SDCC compile
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@20 42af7a65-404d-4744-a932-0658087f49c3
2007-02-27 21:17:21 +00:00

150 lines
4.3 KiB
C

/************************************************************
* fs_dup.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.
*
************************************************************/
/************************************************************
* Compilation Switches
************************************************************/
/************************************************************
* Included Files
************************************************************/
#include <nuttx/config.h>
#if CONFIG_NFILE_DESCRIPTORS > 0
#include <sys/types.h>
#include <unistd.h>
#include <sched.h>
#include <errno.h>
#include "fs_internal.h"
/************************************************************
* Definitions
************************************************************/
#define DUP_ISOPEN(fd, list) \
((unsigned int)fd < CONFIG_NFILE_DESCRIPTORS && \
list->fl_files[fd].f_inode != NULL)
/************************************************************
* Private Functions
************************************************************/
/************************************************************
* Global Functions
************************************************************/
int dup(int fildes)
{
FAR struct filelist *list;
int fildes2;
/* Get the thread-specific file list */
list = sched_getfiles();
if (!list)
{
*get_errno_ptr() = EMFILE;
return ERROR;
}
/* Verify that fildes is a valid, open file descriptor */
if (!DUP_ISOPEN(fildes, list))
{
*get_errno_ptr() = EBADF;
return ERROR;
}
/* Increment the reference count on the contained inode */
inode_addref(list->fl_files[fildes].f_inode);
/* Then allocate a new file descriptor for the inode */
fildes2 = files_allocate(list->fl_files[fildes].f_inode,
list->fl_files[fildes].f_oflags,
list->fl_files[fildes].f_pos);
if (fildes2 < 0)
{
*get_errno_ptr() = EMFILE;
inode_release(list->fl_files[fildes].f_inode);
return ERROR;
}
return fildes2;
}
int dup2(int fildes1, int fildes2)
{
FAR struct filelist *list;
/* Get the thread-specific file list */
list = sched_getfiles();
if (!list)
{
*get_errno_ptr() = EMFILE;
return ERROR;
}
/* Verify that fildes is a valid, open file descriptor */
if (!DUP_ISOPEN(fildes1, list))
{
*get_errno_ptr() = EBADF;
return ERROR;
}
/* Handle a special case */
if (fildes1 == fildes2)
{
return fildes1;
}
/* Verify fildes2 */
if ((unsigned int)fildes2 >= CONFIG_NFILE_DESCRIPTORS)
{
*get_errno_ptr() = EBADF;
return ERROR;
}
return files_dup(&list->fl_files[fildes1], &list->fl_files[fildes2]);
}
#endif /* CONFIG_NFILE_DESCRIPTORS */