From: "Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: [Q] Is it possible to write-protect the text section ?
Date: Thu, 10 Jul 1997 22:44:01
Organization: Aspen Technology, Inc.
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Message-ID: <33c565b1.sandmann@clio.rice.edu>
References: <5q2oak$mfh$2 AT arcturus DOT ciril DOT fr>
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Yes, but...

sys/mman.h mprotect() will provide a way to make pages readonly.  There
is a (very bad) place in exceptn.S which writes to the text section to
store things which need to be locked (I regret doing this, so the text
can't be easily automatically made readonly).  This page or two needs to
be kept read/write (unless someone fixes it...)

And this only works with DPMI 1.0 features, so you would need CWSDPMI or
386MAX to make it work.