View file File name : process_watch.rb Content :module EventMachine # This is subclassed from EventMachine::Connection for use with the process monitoring API. Read the # documentation on the instance methods of this class, and for a full explanation see EventMachine.watch_process. class ProcessWatch < Connection # @private Cfork = 'fork'.freeze # @private Cexit = 'exit'.freeze # @private def receive_data(data) case data when Cfork process_forked when Cexit process_exited end end # Returns the pid that EventMachine::watch_process was originally called with. def pid @pid end # Should be redefined with the user's custom callback that will be fired when the prcess is forked. # # There is currently not an easy way to get the pid of the forked child. def process_forked end # Should be redefined with the user's custom callback that will be fired when the process exits. # # stop_watching is called automatically after this callback def process_exited end # Discontinue monitoring of the process. # This will be called automatically when a process dies. User code may call it as well. def stop_watching EventMachine::unwatch_pid(@signature) end end end