> That would be my question too. I know a little (but not much) about > hardening code, and I am aware of some of the issues if there can be > unexpected outside influences on your program (such as radiation or > hardware issues causing changes to memory locations). I can't see any > way in which some sort of general duplication of variables would help. The 'proper' way to do it is with C macro's that can be used to declare, increment, and decrement, values in a redundnat structure containing both the inverted value as well as non-inverted value, a macro for setting the value (which also sets the inverted value), and a macro (and error handling) for checking the value and ensuring that it is the inverse of the inverted-values before it is used .. -- ; Thales Austria GmbH Jay Vaughan, Scheydgasse 41 Software Developer 1210 Vienna AUSTRIA ============================================--------------------
