93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/****************************************************************************
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* fs/vfs/fs_getfilep.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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* 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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* Input Parameters:
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* fd - The file descriptor
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* filep - The location to return the struct file instance
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned on
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* any failure.
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*
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****************************************************************************/
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int fs_getfilep(int fd, FAR struct file **filep)
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{
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FAR struct filelist *list;
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DEBUGASSERT(filep != NULL);
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*filep = (FAR struct file *)NULL;
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if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
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{
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return -EBADF;
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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 = nxsched_get_files();
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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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return -EAGAIN;
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}
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/* And return the file pointer from the list */
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*filep = &list->fl_files[fd];
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return OK;
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}
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