Re: copy to suer space

[Joerg Pommnitz <pommnitz@yahoo.com>]

Nick LeRoy <nleroy@cs.wisc.edu> wrote:

 > Linux executables are "demand paged".  What this means is that they are

 > loaded as they are "page faulted" in.  If low on memory, the kernel 
 > may, at it's discression, discard text pages at any time.  When a 
 > discarded page is referenced, a page fault occurs, and the page is re-
 > loaded from the executable.  They are *never* written out to swap 
 > space.  The kernel fully expects the text file and the text memory 
 > pages to not be modified during execution.

Clean pages are never written to swap space. If the page is dirty, it's
just another data page. If it were otherwise, non-PIC shared libraries
that require fixups from the dynamic linker would not work.

Regards
  Joerg


=====
-- 
Regards
       Joerg


__________________________________________________
Do You Yahoo!?
Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month.
http://geocities.yahoo.com/ps/info1