sync

/*
 *  call-seq:
 *     ios.sync    => true or false
 *  
 *  Returns the current ``sync mode'' of <em>ios</em>. When sync mode is
 *  true, all output is immediately flushed to the underlying operating
 *  system and is not buffered by Ruby internally. See also
 *  <code>IO#fsync</code>.
 *     
 *     f = File.new("testfile")
 *     f.sync   #=> false
 */

static VALUE
rb_io_sync(io)
    VALUE io;
{
    rb_io_t *fptr;

    GetOpenFile(io, fptr);
    return (fptr->mode & FMODE_SYNC) ? Qtrue : Qfalse;
}