162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/****************************************************************************
|
|
* fs/shm/shm_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 <stdio.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
|
|
#include "inode/inode.h"
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
static int file_shm_unlink(FAR const char *name)
|
|
{
|
|
FAR struct inode *inode;
|
|
struct inode_search_s desc;
|
|
char fullpath[sizeof(CONFIG_FS_SHMFS_VFS_PATH) + CONFIG_NAME_MAX + 2];
|
|
int ret;
|
|
|
|
/* Make sure that a non-NULL name is supplied */
|
|
|
|
if (!name)
|
|
{
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* Remove any number of leading '/' */
|
|
|
|
while (*name == '/')
|
|
{
|
|
name++;
|
|
}
|
|
|
|
/* Empty name supplied? */
|
|
|
|
if (*name == '\0')
|
|
{
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* Name too long? */
|
|
|
|
if (strnlen(name, CONFIG_NAME_MAX + 1) > CONFIG_NAME_MAX)
|
|
{
|
|
return -ENAMETOOLONG;
|
|
}
|
|
|
|
/* Get the full path to the shm object */
|
|
|
|
snprintf(fullpath, sizeof(fullpath),
|
|
CONFIG_FS_SHMFS_VFS_PATH "/%s", name);
|
|
|
|
/* Get the inode for this shm object */
|
|
|
|
SETUP_SEARCH(&desc, fullpath, false);
|
|
|
|
ret = inode_lock();
|
|
if (ret < 0)
|
|
{
|
|
goto errout_with_search;
|
|
}
|
|
|
|
ret = inode_find(&desc);
|
|
if (ret < 0)
|
|
{
|
|
/* There is no inode that includes in this path */
|
|
|
|
goto errout_with_sem;
|
|
}
|
|
|
|
/* Get the search results */
|
|
|
|
inode = desc.node;
|
|
|
|
/* Verify that what we found is, indeed, an shm inode */
|
|
|
|
if (!INODE_IS_SHM(inode))
|
|
{
|
|
ret = -ENOENT;
|
|
goto errout_with_inode;
|
|
}
|
|
|
|
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
|
|
if (inode->u.i_ops->unlink)
|
|
{
|
|
/* Notify the shmfs driver that it has been unlinked */
|
|
|
|
ret = inode->u.i_ops->unlink(inode);
|
|
if (ret < 0)
|
|
{
|
|
goto errout_with_inode;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Remove the old inode from the tree. If we hold a reference count
|
|
* on the inode, it will not be deleted now. This will set the
|
|
* FSNODEFLAG_DELETED bit in the inode flags.
|
|
*/
|
|
|
|
ret = inode_remove(fullpath);
|
|
|
|
/* inode_remove() should always fail with -EBUSY because we have a
|
|
* reference on the inode. -EBUSY means that the inode was, indeed,
|
|
* unlinked but it could not be freed because there are references.
|
|
*/
|
|
|
|
if (ret == -EBUSY)
|
|
{
|
|
ret = OK;
|
|
}
|
|
|
|
DEBUGASSERT(ret == OK);
|
|
|
|
errout_with_inode:
|
|
inode_release(inode);
|
|
errout_with_sem:
|
|
inode_unlock();
|
|
errout_with_search:
|
|
RELEASE_SEARCH(&desc);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
int shm_unlink(FAR const char *name)
|
|
{
|
|
int ret = file_shm_unlink(name);
|
|
|
|
if (ret < 0)
|
|
{
|
|
set_errno(-ret);
|
|
return ERROR;
|
|
}
|
|
|
|
return ret;
|
|
}
|