96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/****************************************************************************
|
|
* drivers/ipcc/ipcc_unlink.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <nuttx/ipcc.h>
|
|
#include <nuttx/kmalloc.h>
|
|
#include <nuttx/semaphore.h>
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
|
|
#include "ipcc_priv.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: ipcc_unlink
|
|
*
|
|
* Description:
|
|
* Action to take upon file unlinking. Function will free resources if
|
|
* noone is using the driver when unlinking occured. If driver is still
|
|
* in use, it will be marked as unlinked and resource freeing will take
|
|
* place in ipcc_close() function instead, once last reference is closed.
|
|
*
|
|
* Input Parameters:
|
|
* inode - driver inode that is being unlinked
|
|
*
|
|
* Returned Value:
|
|
* OK on successfull close, or negated errno on failure.
|
|
*
|
|
* Assumptions/Limitations:
|
|
*
|
|
****************************************************************************/
|
|
|
|
int ipcc_unlink(FAR struct inode *inode)
|
|
{
|
|
FAR struct ipcc_driver_s *priv;
|
|
int ret;
|
|
|
|
/* Get our private data structure */
|
|
|
|
priv = inode->i_private;
|
|
|
|
/* Get exclusive access to the IPCC driver state structure */
|
|
|
|
if ((ret = nxmutex_lock(&priv->lock)) < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Is anyone still using the driver? */
|
|
|
|
if (priv->crefs <= 0)
|
|
{
|
|
/* No, we are free to free resources */
|
|
|
|
ipcc_cleanup(priv);
|
|
return OK;
|
|
}
|
|
|
|
/* Yes, someone is still using the driver, just mark file
|
|
* as unlinked and free resources in ipcc_close() once last
|
|
* reference is closed
|
|
*/
|
|
|
|
priv->unlinked = true;
|
|
nxmutex_unlock(&priv->lock);
|
|
return OK;
|
|
}
|