Article View: comp.os.msdos.programmer
Article #6134Re: Does a Set S.D.A. function exist in DOS ?
From: Ralf Brown
Date: Mon, 13 May 1991 16:08
Date: Mon, 13 May 1991 16:08
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1557 bytes
In article <17301.282b344c@ul.ie> 8807035@ul.ie writes:
} My problem is I've got the calling parameters for finding the SDA : Func 5dh
}Subfunc 06 (quoted in the article). However there are no function parameters
}stated for setting the fgnd_SDA to my_SDA, for example; although it's feasible
}to make a copy of the SDA in some alloc'ed memory and swap it back after
}the spawned program has run.
There is no such function, because the DOS kernel refers to absolute addresses
(going through a pointer would needlessly slow down DOS). You have to
physically make a copy of the SDA and then physically overwrite it with a
previously saved copy.
--
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!tut.cis.ohio-state.edu!sei.cmu.edu!fs7.ece.cmu.edu!o.gp.cs.cmu.edu!ralf From: ralf+@cs.cmu.edu (Ralf Brown) Newsgroups: comp.os.msdos.programmer Subject: Re: Does a Set S.D.A. function exist in DOS ? Keywords: TSR, SDA, Byte's March 'Zine. Message-ID: <1991May13.160822.8281@cs.cmu.edu> Date: 13 May 91 16:08:22 GMT References: <17301.282b344c@ul.ie> Sender: netnews@cs.cmu.edu (USENET News Group Software) Organization: School of Computer Science, Carnegie Mellon Lines: 20