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Old malloc change -- explanation wanted

I'm trying to understand the following change:

1998-08-28 09:22  Ulrich Drepper  <drepper@cygnus.com>

	* malloc/malloc.c (malloc_hook_ini): Don't overwrite realloc and
	memalign hook.
	(realloc_hook_ini): Don't overwrite memalign hook.
	(memalign_hook_ini): Don't overwrite malloc and memalign hooks.
	Reported by Philippe Troin <phil@fifi.org>.

Why was/is overwriting the hooks in question a problem ?

Thanks,
Wolfram.
-- 
`Surf the sea, not double-u three...'
wmglo@dent.med.uni-muenchen.de
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