signal SIGIO, code <num>

  Explanation:  An 'asynchronous I/O'  signal  was  raised  as  an
  exception  in  response  to the arithmetic or software condition
  specified by the given code.  SIGAIO (base lan i/o), SIGPTY (pty
  i/o), and SIGPOLL (STREAMS i/o) are other names for this signal.

  User Action:  Eliminate the cause of  the  error  condition  and
  retry the operation.