(PHP 4 >= 4.1.0, PHP 5)
pcntl_wtermsig — Returns the signal which caused the child to terminate
$status
   )
   Returns the number of the signal that caused the child process to
   terminate. This function is only useful if
   pcntl_wifsignaled() returned TRUE.
  
statusThe status
parameter is the status parameter supplied to a successful
call to pcntl_waitpid().
Returns the signal number, as an integer.