122 lines
4.0 KiB
C
122 lines
4.0 KiB
C
/****************************************************************************
|
|
* fs/fs_filedup2.c
|
|
*
|
|
* Copyright (C) 2007-2009 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 "fs_internal.h"
|
|
|
|
#if CONFIG_NFILE_DESCRIPTORS > 0
|
|
|
|
/****************************************************************************
|
|
* Definitions
|
|
****************************************************************************/
|
|
|
|
#define DUP_ISOPEN(fd, list) \
|
|
((unsigned int)fd < CONFIG_NFILE_DESCRIPTORS && \
|
|
list->fl_files[fd].f_inode != NULL)
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Global Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: file_dup2
|
|
*
|
|
* Description:
|
|
* Clone a file descriptor or socket descriptor to a specific descriptor
|
|
* number. If socket descriptors are implemented, then this is called by
|
|
* dup2() for the case of file descriptors. If socket descriptors are not
|
|
* implemented, then this function IS dup2().
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
|
|
int file_dup2(int fildes1, int fildes2)
|
|
#else
|
|
int dup2(int fildes1, int fildes2)
|
|
#endif
|
|
{
|
|
FAR struct filelist *list;
|
|
|
|
/* Get the thread-specific file list */
|
|
|
|
list = sched_getfiles();
|
|
if (!list)
|
|
{
|
|
errno = EMFILE;
|
|
return ERROR;
|
|
}
|
|
|
|
/* Verify that fildes is a valid, open file descriptor */
|
|
|
|
if (!DUP_ISOPEN(fildes1, list))
|
|
{
|
|
errno = EBADF;
|
|
return ERROR;
|
|
}
|
|
|
|
/* Handle a special case */
|
|
|
|
if (fildes1 == fildes2)
|
|
{
|
|
return fildes1;
|
|
}
|
|
|
|
/* Verify fildes2 */
|
|
|
|
if ((unsigned int)fildes2 >= CONFIG_NFILE_DESCRIPTORS)
|
|
{
|
|
errno = EBADF;
|
|
return ERROR;
|
|
}
|
|
|
|
return files_dup(&list->fl_files[fildes1], &list->fl_files[fildes2]);
|
|
}
|
|
|
|
#endif /* CONFIG_NFILE_DESCRIPTORS > 0 */
|
|
|