Re: don't let mmap allocate down to zero

[Chris Friesen]

linux-os wrote:

> The seg-fault you get when you de-reference a pointer to NULL
> is caused by the kernel. You are attempting to access memory
> that has not been mapped into your address space. Once that
> memory gets mmap()ed, you will no longer get a seg-fault.
> Again, the seg-fault has nothing to do with 'C'. It's an
> implementation behavior that can be changed with mmap().

The segfault *does* have something to do with C.  The standard says that 
the result of dereferencing a NULL pointer is *undefined*.  Not 
implementation-defined, but undefined.  Anything relying on 
dereferencing NULL pointers is not valid C code.

Chris
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