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mongoc_stream_flush - mongoc_stream_flush()
int mongoc_stream_flush (mongoc_stream_t *stream);
· stream: A mongoc_stream_t. This function shall flush any buffered bytes in the underlying stream to the physical transport. It mimics the API and semantics of fflush(), forcing a write of user space buffered data. Not all stream implementations may implement this feature.
0 is returned on success, otherwise -1 and errno is set.
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