virtual memory range that can be used for wrong pointers

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  Hello.

I have a code where i need more than one "wrong" pointer value(this one is
NULL pointer). Something like a signal handler SIG_IGN that equal to 1.

So, my question is, what is the guarantied range of addresses (from 0 to X),
which can be safely used for this purpose on any hardware architecture?

Thanks.

-- 
Олег Неманов (Oleg Nemanov)
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