MS-DOS Swapping Spawn, HIMEM.SYS

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#2210

From: Len Reed
Date: Fri, 03 Aug 1990 21:59

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Does anyone know how HIMEM.SYS (it comes with Microsoft C 6.0) works?
The ram disk and codeview use it to access extended memory.

I want to modify a program to do a swapping spawn on MS-DOS.  That is,
it should copy itself to extended memory, free nearly all of its memory,
run the sub-process, and the bring itself back in.

I could use the int 15h BIOS copy to do the copy in/ copy out, but if I
can tie into HIMEM.SYS this could both simplify the problem and ensure
compatibility with other extended memory uses.

Anyone know how to tie into this driver or how I can find out?

Thanks.
-- 
Len Reed
Holos Software, Inc.
Voice: (404) 496-1358
UUCP: ...!gatech!holos0!lbr

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!uwm.edu!lll-winken!uunet!aplcen!haven!uflorida!mephisto!gatech!holos0!lbr
From: lbr@holos0.uucp (Len Reed)
Newsgroups: comp.sys.ibm.pc.misc
Subject: MS-DOS Swapping Spawn, HIMEM.SYS
Keywords: MS-DOS spawn swap HIMEM
Message-ID: <1990Aug3.215922.10216@holos0.uucp>
Date: 3 Aug 90 21:59:22 GMT
Sender: lbr@holos0.uucp (Len Reed)
Organization: Holos Software, Inc., Atlanta, GA
Lines: 19