Re: don't let mmap allocate down to zero

[Chris Friesen]

Bryn Reeves wrote:

> RETURN VALUE
>   For calloc() and malloc(), the value returned is a pointer to the
>   allocated  memory,  which  is suitably aligned for any kind of
>   variable, or NULL if the request fails.
>
> This could get pretty confusing if NULL was a valid address...

Internally the library can use mmap().  Presumably they will map a 
MAP_FAILED return code from mmap() to a NULL return code in malloc().

Chris
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