🚀 go-pugleaf

crlstu4@bnr.ca (Goetz von Escher) writes:


>Hi there!

>Is there a way to find out if a pointer is a valid pointer in C/C++?
>Or in other words: If I want to read a value in memory, how do I
>know wether I can read the value at this address without causing
>an exception (bus error, segmentation fault and that stuff)?

>Anything?
>Goetz
The ARM says you can't. Burn candles and sing. On the other side, if
you have to check whether you can store your values, you have a lousy program.
One does not just use any memory which does not cause a violation, you
know. If you really are into muck, try catching the segmentation violation,
and other signals. You will have to return through some setjmp/longjmp-
construct, but this stinks. If you get a violation, it
has good reason. Trying in any way to ignore or circumvent it is
madness. Be glad the MMU is there to protect you from your folly!