lib/master.js
function startListening() {
    if (shouldBind) {
      try {
        bind(self.fd, self.port, self.host);
        listen(self.fd, self.options.backlog);
      } catch(e) {
        self.kill('SIGKILL');
        throw e;
      }
    }
    self.callback && self.callback();
    self.emit('listening');
  }
function startListening() {
    if (shouldBind) {
      try {
        bind(self.fd, self.port, self.host);
        listen(self.fd, self.options.backlog);
      } catch(e) {
        self.kill('SIGKILL');
        throw e;
      }
    }
    self.callback && self.callback();
    self.emit('listening');
  }
function startListening ( ) { if ( shouldBind ) { try { bind ( self . fd , self . port , self . host ) ; listen ( self . fd , self . options . backlog ) ; } catch ( e ) { self . kill ( 'SIGKILL' ) ; throw e ; } } self . callback && self . callback ( ) ; self . emit ( 'listening' ) ; }
bind / listen
bind / listen