Path: utzoo!attcan!uunet!samsung!umich!umeecs!jherbers
From: jherbers@zip.eecs.umich.edu (Joseph Edward Herbers)
Newsgroups: comp.unix.questions
Subject: Setting Inaccessible Pages (?)
Keywords: memory segmentation fault
Message-ID: <2558@zipeecs.umich.edu>
Date: 7 Jun 90 20:15:02 GMT
Organization: University of Michigan EECS Dept., Ann Arbor
Lines: 19


Is there a way to mark pages as inaccessible in 4.3BSD?

What I have done is set up memory myself using brk()/sbrk()
and trap the segmentation fault that results when I try to use
memory beyond what I have allocated.

What I WANT to do is divide up my memory into diff regions and
I want to have a signal issued that I can catch whenever any of
the regions attempts to grow outside its bounds.  So, if I could
separate the regions by inaccessible pages, then an attempt to
access beyond the bounds would result in a segmentation fault
that I can trap.  I can decide in the handler routine which of
the regions exceeded its bounds, and act accordingly.

So How can I mark pages as inaccessible???


Joe Herbers