Method PrepareParents

util/system/shellcommand.cpp:238–248

pipes are closed by automatic dtor

        TRealPipeHandle InputPipeFd[2];
        // pipes are closed by automatic dtor
        void PrepareParents() {
            if (OutputPipeFd[1].IsOpen()) {
                OutputPipeFd[1].Close();
            }
            if (ErrorPipeFd[1].IsOpen()) {
                ErrorPipeFd[1].Close();
            }
            if (InputPipeFd[1].IsOpen()) {
                InputPipeFd[0].Close();
            }
        }
        void ReleaseParents() {
            InputPipeFd[1].Release();
            OutputPipeFd[0].Release();