Message-ID:	<34BBF982.4525B8F9@eik.bme.hu>
Date:	Wed, 14 Jan 1998 00:32:18 +0100
From:	"Dr. András Sólyom" <solyom AT eik DOT bme DOT hu>
MIME-Version:	1.0
To:	djgpp AT delorie DOT com
Subject:	Q: How to check validity of a pointer?

One of my programs keep crashing on realloc() and I cannot find the
reason. I am allocating and reallocating some million times and somehow
some pointers in the program which were valid becomes invalid, usually
having a value of 0x09000000). I have tried many things (like using one
of DJ's malloc()'s, or compiling under linux with ElectricFence) to
catch the error but without success. So for debugging I can try to catch
the invalid pointers.
Is there any way to check a pointer for validity before dereferencing
it?

                                                    Andras

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