100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_wrflush_unlocked.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 <fcntl.h>
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#include <errno.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: lib_wrflush_unlocked
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*
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* Description:
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* This is simply a version of fflush that does not report an error if
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* the file is not open for writing.
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*
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****************************************************************************/
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int lib_wrflush_unlocked(FAR FILE *stream)
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{
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#ifndef CONFIG_STDIO_DISABLE_BUFFERING
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/* Verify that we were passed a valid (i.e., non-NULL) stream */
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#ifdef CONFIG_DEBUG_FEATURES
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if (stream == NULL)
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{
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return -EINVAL;
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}
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#endif
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/* Do nothing if there is no I/O buffer */
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if (stream->fs_bufstart == NULL)
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{
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return OK;
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}
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/* Verify that the stream is opened for writing... lib_fflush will
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* return an error if it is called for a stream that is not opened for
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* writing. Check that first so that this function will not fail in
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* that case.
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*/
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if ((stream->fs_oflags & O_WROK) == 0)
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{
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/* Report that the success was successful if we attempt to flush a
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* read-only stream.
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*/
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return OK;
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}
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/* Flush the stream. Return success if there is no buffered write data
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* -- i.e., that the stream is opened for writing and that all of the
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* buffered write data was successfully flushed by lib_fflush().
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*/
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return lib_fflush_unlocked(stream);
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#else
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/* Verify that we were passed a valid (i.e., non-NULL) stream */
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#ifdef CONFIG_DEBUG_FEATURES
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if (!stream)
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{
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return -EINVAL;
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}
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#endif
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return OK;
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#endif
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}
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