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Mail Archives: djgpp/1999/10/21/19:00:46

From: pjfarley AT banet DOT net (Peter J. Farley III)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Are there any memory debuggers other than MSS and YAMD?
Date: Thu, 21 Oct 1999 20:21:24 GMT
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Eli Zaretskii <eliz AT is DOT elta DOT co DOT il> wrote:
>On Wed, 20 Oct 1999, Peter J. Farley III wrote:
>> I'm running DJGPP v2.02, gcc 2.8.1 (10-28-98), libc/libg/libm 11-15-98
>> in a W95 DOS box, LFN=Y.
>AFAIK, YAMD won't help you on Windows, since it uses several DPMI
>functions for which you need CWSDPMI.  Can you try this in plain DOS
>mode?

Sorry, I should have said I have already done so, with R4 of CWSDPMI,
with no success in getting YAMD to actually report anything.  I *did*
RTFM, and Nate specifically states that YAMD must be used in plain DOS
with CWSDPMI.

My assumption at the moment is that I am not using it correctly, which
is what I will be talking about privately to Nate.

>> Call frame traceback EIPs:
>>   0x00024b90   _malloc+192
>
>Crashes at malloc+192 are a tell-tale sign of a program that either
>overruns an malloc'ed buffer, or calls free more than once with the
>same pointer.

My deduction as well, without the benefit of knowing that this
location in malloc is a symptom.

>One possible approach to attack these problems goes like this:
<Detailed instructions snipped>

Thank you, Eli, I will try those instructions out and report the
results later.

----------------------------------------------------
Peter J. Farley III (pjfarley AT nospam DOT dorsai DOT org OR
                     pjfarley AT nospam DOT banet DOT net)

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