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Roberto Ierusalimschy wrote:
> The drawback is that everyone using Lua would have to start it with
> something like
>   lua_open(&realloc);
> which is not exactly friendly... 

Not really. Lua _open can do that behind our backs. 
You keep the "callback functions"/"hooks" stored as 
funcion pointers  somewhere in the Lua state. By default, 
the state is set up by lua_open to use the default ANCI C 
functions. The callback can then be changed by a new LUA api 
call such has lua_set_callbacks(lua_state *, 
lua_callback_struct *);

I can elaborate, and even suggest a patch, if you wish.

"No one knows true heroes, for they speak not of their greatness." -- 
Daniel Remar.
Björn De Meyer