Setting Inaccessible Pages (?)

[Joseph Edward Herbers]

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