96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
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/****************************************************************************
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* fs/mmap/fs_msync.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 <sys/mman.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/sched.h>
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#include "inode/inode.h"
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#include "fs_rammap.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: msync
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*
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* Description:
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* Equivalent to the standard msync() function except that it accepts
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* a struct file instance instead of a memory address and it does not set
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* the errno variable.
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*
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* Input Parameters:
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* file - A pointer to the struct file instance representing the
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* mappedfile
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* start - The starting address of the memory region to be synchronized
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* length - The length of the memory region to be synchronized
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* flags - Flags that determine the type of synchronization to be
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* performed
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*
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* Returned Value:
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* On success, returns 0 (OK); On failure, returns a negated errno value.
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*
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****************************************************************************/
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int msync(FAR void *start, size_t length, int flags)
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{
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FAR struct mm_map_entry_s *entry;
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int ret;
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ret = mm_map_lock();
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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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entry = mm_map_find(get_current_mm(), start, length);
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if (!entry)
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{
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ferr("ERROR: Region not found\n");
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ret = -ENOMEM;
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goto out;
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}
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if (entry->msync == NULL)
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{
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ret = OK;
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goto out;
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}
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ret = entry->msync(entry, start, length, flags);
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out:
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mm_map_unlock();
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if (ret < 0)
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{
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set_errno(-ret);
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ret = ERROR;
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}
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return ret;
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}
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