Xref: utzoo comp.unix.internals:3027 comp.unix.xenix.misc:245 comp.sys.intel:1743
Newsgroups: comp.unix.internals,comp.unix.xenix.misc,comp.sys.intel
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!van-bc!cynic!curt
From: curt@cynic.wimsey.bc.ca (Curt Sampson)
Subject: Re: How to access U area from proc table
Organization: Mad Artists' Technological Hangout
Date: Sat, 15 Jun 1991 11:43:46 GMT
Message-ID: <1991Jun15.114346.11723@cynic.wimsey.bc.ca>
References: <8D-B4F1@xds13.ferranti.com>

In article <8D-B4F1@xds13.ferranti.com>
  kunkee@ficc.ferranti.com (randy kunkee) writes:

> I expected the ADDR field of ps -l to point directly to the U area, but
> it does not.  Apparently it points to a 7 to 9 byte structure which
> then points to the U area.  This is small structure is what is referenced
> by proc.p_caddr.

It's probably a little trickier than that, actually.  My device driver
handbook that came with my 286 SCO Xenix indicates that a u_area can
be swapped out (specifically, it warns against interupt routines
attempting to modify the u_area of any process).

cjs
-- 
                        | "This sound system comes to you with fuel injection.
Curt Sampson            |  Toes tapping, the unthinking masses dance to a new
curt@cynic.uucp         |  tune. . . . Undress yourself to this bastard.  Suck
curt@cynic.wimsey.bc.ca |  on this plan of noise, bimbo!"       --Gary Clail