(PHP 4 >= 4.1.0, PHP 5)
pcntl_wstopsig — Returns the signal which caused the child to stop
$status
   )
   Returns the number of the signal which caused the child to stop.
   This function is only useful if
   pcntl_wifstopped() returned TRUE.
  
statusThe status
parameter is the status parameter supplied to a successful
call to pcntl_waitpid().
Returns the signal number.