115 lines
3.9 KiB
C
115 lines
3.9 KiB
C
/****************************************************************************
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* fs/vfs/fs_getfilep.c
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*
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* Copyright (C) 2014, 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <errno.h>
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#include "inode/inode.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: fs_getfilep
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*
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* Description:
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* Given a file descriptor, return the corresponding instance of struct
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* file. NOTE that this function will currently fail if it is provided
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* with a socket descriptor.
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*
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* Parameters:
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* fd - The file descriptor
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*
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* Return:
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* A point to the corresponding struct file instance is returned on
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* success. On failure, NULL is returned and the errno value is
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* set appropriately (EBADF).
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*
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****************************************************************************/
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FAR struct file *fs_getfilep(int fd)
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{
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FAR struct filelist *list;
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int errcode;
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if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
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{
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errcode = EBADF;
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goto errout;
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}
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/* The descriptor is in a valid range to file descriptor... Get the
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* thread-specific file list.
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*/
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list = sched_getfiles();
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/* The file list can be NULL under two cases: (1) One is an obscure
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* cornercase: When memory management debug output is enabled. Then
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* there may be attempts to write to stdout from malloc before the group
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* data has been allocated. The other other is (2) if this is a kernel
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* thread. Kernel threads have no allocated file descriptors.
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*/
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if (list == NULL)
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{
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errcode = EAGAIN;
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goto errout;
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}
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/* And return the file pointer from the list */
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return &list->fl_files[fd];
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errout:
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set_errno(errcode);
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return NULL;
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}
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