0148e1d501
Note: all attributes is guarded by PSEUDOFS_ATTRIBUTES to save the space Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: I664d60382e356068fd920f08aca5b4a49d8d92a9
94 lines
3 KiB
C
94 lines
3 KiB
C
/****************************************************************************
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* fs/driver/fs_registerdriver.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 <errno.h>
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#include <nuttx/fs/fs.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: register_driver
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*
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* Description:
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* Register a character driver inode the pseudo file system.
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*
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* Input Parameters:
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* path - The path to the inode to create
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* fops - The file operations structure
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* mode - inmode privileges
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* priv - Private, user data that will be associated with the inode.
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*
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* Returned Value:
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* Zero on success (with the inode point in 'inode'); A negated errno
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* value is returned on a failure (all error values returned by
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* inode_reserve):
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*
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* EINVAL - 'path' is invalid for this operation
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* EEXIST - An inode already exists at 'path'
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* ENOMEM - Failed to allocate in-memory resources for the operation
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*
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****************************************************************************/
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int register_driver(FAR const char *path,
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FAR const struct file_operations *fops,
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mode_t mode, FAR void *priv)
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{
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FAR struct inode *node;
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int ret;
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/* Insert a dummy node -- we need to hold the inode semaphore because we
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* will have a momentarily bad structure.
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*/
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ret = inode_semtake();
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if (ret < 0)
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{
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return ret;
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}
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ret = inode_reserve(path, mode, &node);
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if (ret >= 0)
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{
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/* We have it, now populate it with driver specific information.
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* NOTE that the initial reference count on the new inode is zero.
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*/
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INODE_SET_DRIVER(node);
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node->u.i_ops = fops;
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node->i_private = priv;
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ret = OK;
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}
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inode_semgive();
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return ret;
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}
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