flush

/*
 *  call-seq:
 *     ios.flush    => ios
 *  
 *  Flushes any buffered data within <em>ios</em> to the underlying
 *  operating system (note that this is Ruby internal buffering only;
 *  the OS may buffer the data as well).
 *     
 *     $stdout.print "no newline"
 *     $stdout.flush
 *     
 *  <em>produces:</em>
 *     
 *     no newline
 */

static VALUE
rb_io_flush(io)
    VALUE io;
{
    OpenFile *fptr;
    FILE *f;

    GetOpenFile(io, fptr);
    rb_io_check_writable(fptr);
    f = GetWriteFile(fptr);

    io_fflush(f, fptr);

    return io;
}