[lwip-users] Re: [lwip] Proposal for magic numbers in LwIP

[Adam Dunkels]

Hi!

On Wednesday 19 June 2002 20.25, you wrote:
> I propose that all structures which are dynamically allocated
> begin with a magic number. Before the structure is free'd this
> number should be set to zero. My own practice is:
>
>   s = nalloc();
>   memset (s, 0, sizeof (*s));
>   s->magic = THE_MAGIC_OF_S;
>
>      ....
>
>   s->magic = 0;
>   free (s);

A good idea! What about wrapping it up in a macro that could be null #defined 
when compiled without debugging? Like this:

s = mem_malloc();
DEBUG_SETMAGIC(s, S_MAGIC_NUMBER);

DEBUG_SETMAGIC(s, 0);
mem_free(s);

... and

DEBUG_CHEKCMAGIC(s, S_MAGIC_NUMBER);

/adam
-- 
Adam Dunkels <address@hidden>
http://www.sics.se/~adam
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