89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_fflush.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 <stdbool.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <nuttx/fs/fs.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: fflush
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*
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* Description:
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* The function fflush() forces a write of all user-space buffered data for
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* the given output or update stream via the stream's underlying write
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* function. The open status of the stream is unaffected.
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*
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* If the stream argument is NULL, fflush() flushes all open output streams.
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*
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* Returned Value:
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* OK on success EOF on failure (with errno set appropriately)
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*
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****************************************************************************/
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int fflush(FAR FILE *stream)
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{
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int ret;
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/* Is the stream argument NULL? */
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if (!stream)
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{
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/* Yes... then this is a request to flush all streams */
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ret = lib_flushall(lib_get_streams());
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}
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else
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{
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ret = lib_fflush(stream);
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}
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/* Check the return value */
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if (ret < 0)
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{
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/* An error occurred during the flush AND/OR we were unable to flush
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* all of the buffered write data. Set the errno value.
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*/
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set_errno(-ret);
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/* And return EOF on failure. */
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return EOF;
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}
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return OK;
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}
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