Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!virtech!cpcahil
From: cpcahil@virtech.UUCP (Conor P. Cahill)
Newsgroups: comp.lang.c
Subject: Re: how do you know 'free' freed?
Summary: use the malloc tracing routines and/or nullify the data
Keywords: free, malloc, memory, allocation
Message-ID: <1269@virtech.UUCP>
Date: 13 Oct 89 01:46:51 GMT
References: <5521@hacgate.UUCP>
Organization: Virtual Technologies Inc
Lines: 18

In article <5521@hacgate.UUCP>, howard@aic.dpl.scg.hac.com (Mike Howard (213)317-5690) writes:
> I've malloc'd a tree structure, and then free'd it, node by node.
> Of course, freeing it just marks it as free, and I can still walk
> through the tree after freeing it.  I'd like to confirm that it is
> in fact free.


You could use the malloc tracing routines available on usenet in
comp.sources.unix/volume18/malloc-trace.Z.  Another thing you 
could do is to nullify each allocated data block before freeing
it.   That way you couldn't wall through the tree again.


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