Re: don't let mmap allocate down to zero

[Chris Friesen <cfriesen@nortelnetworks.com>]

linux-os wrote:

> Does this mean that we can't mmap the screen regen buffer at
> 0x000b8000 anymore?
> 
> How do I look at the real-mode interrupt table starting at
> offset 0? You know that the return value of mmap is to be
> checked for MAP_FAILED, not for NULL, don't you?

Can't you still map those physical addresses to other virtual addresses?

> What 'C' standard do you refer to? Seg-faults on null pointers
> have nothing to do with the 'C' standard and everything to
> do with the platform.

I believe the ISO/IEC 9899:1999 C Standard explicitly states that 
dereferencing a null pointer with the unary * operator results in 
undefined behavior.

Chris