Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!munnari.oz.au!csource!david
From: david@csource.OZ.AU (david nugent)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Retrieving the value of FILES=???
Keywords: Global File Handle Table
Message-ID: <534@csource.OZ.AU>
Date: 18 Jun 90 05:22:59 GMT
References: <605@digigw.digital.co.jp> <4057@jato.Jpl.Nasa.Gov> <1990Jun15.133128.17259@druid.uucp>
Organization: Unique Computing Pty Ltd, Melb, Aust.
Lines: 21

In <1990Jun15.133128.17259@druid.uucp> darcy@druid.uucp (D'Arcy J.M. Cain) writes:

>Use int 67h to set up this value - this makes sure value is known.

>It then sets up a hook to int 67h to check for special value in BX (say
>-1) and returns current value if it is that special value.  Otherwise
>it calls the original int 67h and keeps track of the new value.  Then
>your programs can call int 67h with -1 to get the current value.

Just a slight correction.  That's not INT 67H; it's INT 21H function 67H.

And -1 in BX is actually a valid value for this call.  It will actually
work provided there's enough memory available.


>No wonder they call it Messy-DOS.  :-)

Yup. ;-)
-- 
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