      function onClose() {
        assert(++state.closes <= 3,
               msg(`Wrong close count: ${state.closes}`));
        if (state.closes === 2)
          server.close();
        else if (state.closes === 3)
          next();
      }
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.