108 lines
3.8 KiB
C
108 lines
3.8 KiB
C
/****************************************************************************
|
|
* fs/vfs/fs_getfilep.c
|
|
*
|
|
* Copyright (C) 2014, 2016-2017 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 <sys/socket.h>
|
|
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sched.h>
|
|
#include <errno.h>
|
|
|
|
#include "inode/inode.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: fs_getfilep
|
|
*
|
|
* Description:
|
|
* Given a file descriptor, return the corresponding instance of struct
|
|
* file. NOTE that this function will currently fail if it is provided
|
|
* with a socket descriptor.
|
|
*
|
|
* Input Parameters:
|
|
* fd - The file descriptor
|
|
* filep - The location to return the struct file instance
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success; a negated errno value is returned on
|
|
* any failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int fs_getfilep(int fd, FAR struct file **filep)
|
|
{
|
|
FAR struct filelist *list;
|
|
|
|
DEBUGASSERT(filep != NULL);
|
|
*filep = (FAR struct file *)NULL;
|
|
|
|
if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
|
|
{
|
|
return -EBADF;
|
|
}
|
|
|
|
/* The descriptor is in a valid range to file descriptor... Get the
|
|
* thread-specific file list.
|
|
*/
|
|
|
|
list = nxsched_get_files();
|
|
|
|
/* The file list can be NULL under two cases: (1) One is an obscure
|
|
* cornercase: When memory management debug output is enabled. Then
|
|
* there may be attempts to write to stdout from malloc before the group
|
|
* data has been allocated. The other other is (2) if this is a kernel
|
|
* thread. Kernel threads have no allocated file descriptors.
|
|
*/
|
|
|
|
if (list == NULL)
|
|
{
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* And return the file pointer from the list */
|
|
|
|
*filep = &list->fl_files[fd];
|
|
return OK;
|
|
}
|