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     The setvbuf function allows the program to control both buffering
     and buffer size for <stream>. The <stream> argument must refer to
     an open file that has not been read from or written to since it
     was opened. The array pointed to by <buffer> is used as the
     buffer, unless <buffer> is NULL and an automatically allocated
     buffer, <size> bytes long, is used.
 
     The mode must be _IOFBF, _IOLBF, or _IONBF. If <mode> is _IOFBF or
     _IOLBF, <size> is used as the size of the buffer. If <mode> is
     _IONBF, the stream is unbuffered and <size> and <buffer> are
     ignored.
 
     The legal values for <size> are greater than 0 and less than
     32,768.
 
     Return Value
 
     The return value for setvbuf is 0 if successful, and a nonzero
     value if an illegal type or buffer size is specified.
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