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     The flushall function writes to their associated files the
     contents of all buffers associated with open output streams. All
     buffers associated with open input streams are cleared of their
     current contents. The next read operation (if there is one) then
     reads new data from the input files into the buffers.
 
     Buffers are automatically flushed when they are full, when streams
     are closed, or when a program terminates normally without closing
     streams.
 
     All streams remain open after the call to flushall.
 
     Return Value
 
     The flushall function returns the number of open streams (input
     and output). There is no error return.
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