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  2. MI400
  3. October 2001

Re: the heap

From: "Hall, Philip" <phall@spss.com>
>
> Can't speak for ALC/FRE, but when I wrote a similar tool for debug of
ILE/C
> programs to detect memory usage/leaks/etc., the C routines
> malloc/calloc/realloc & free use a header* that is placed before the
memory
> allocated. This information contains the amount allocated. On calling
free()

Looking at the 16 bytes before the allocation, pos 1 always contains a
X'AF', and pos 7 - 8 contains a value that increases by 16 or 32 for each
allocation. ( I did 32 ALCHSS in a row and examined the 16 bytes before and
after the alloc. ).

-Steve

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