check rawmode switch

test.js

'use strict';

var state = false;
function readbin(_state) {
  if (_state === state) {
    console.log('not changing state (' + state + ')');
    return;
  }
  console.log('changing state (' + _state + ')');
  
  var stop = function() {
    rawMode(false);
    process.stdin.removeAllListeners('data');
  }
  
  state = _state;
  if (_state) {
    rawMode(true);
    
    var listener = function(buffer) {
      console.log(JSON.stringify(buffer));   
      if (eq(buffer, [3])) { // ctrl+c
        stop()
        process.exit(0);
      } else if (eq(buffer, [113])) { // q
        stop();
      }
    }
    
    process.stdin.on('data', listener);
  } else {
    stop();
  }
}

function rawMode(_raw) {
  process.stdin.setRawMode(_raw);
}

function eq(buffer, octals) {
  if (buffer.length !== octals.length) { return false; }
  for (var i=0, l=buffer.length; i<l; ++i) {
    if (buffer[i] !== octals[i]) { return false; }
  }
  return true;
}

readbin(true);

setInterval(function() {
  console.log('\n [FLIP!] \n')
  readbin(!state);
}, 3000);