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From: slerner@sesame.UUCP (Simcha-Yitzchak Lerner)
Newsgroups: net.micro.pc
Subject: Re: Who issued the int 16???
Message-ID: <386@sesame.UUCP>
Date: Wed, 23-Oct-85 18:06:19 EDT
Article-I.D.: sesame.386
Posted: Wed Oct 23 18:06:19 1985
Date-Received: Sat, 26-Oct-85 07:47:35 EDT
References: <489@ttidcb.UUCP>
Organization: Lotus Development Corp
Lines: 23

> 
> Does anyone know (rhetoric question -- more correct: who knows and who
> will tell me) how, an interrupt routine which is monitoring int 16
> BIOS calls (a la the desk program in last month's byte magazine) can
> tell whether COMMAND.COM issued the call or some other resident pro-
> cess?
> 

(Aha! Another case for SuperHacker!)

I suggest you look at the CS value on the stack when you are called.


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Simcha-Yitzchak Lerner

              {genrad|ihnp4|ima}!wjh12!talcott!sesame!slerner
                      {cbosgd|harvard}!talcott!sesame!slerner
                       talcott!sesame!slerner@harvard.ARPA