Deepanwita
on 2012-03-31 09:30:00
see page82 from the book 'System Software' by Nithyashri at http://books.google.co.in/books?id=1HXWZTa2T4sC&printsec=frontcover#v=onepage&q&f=false
also consult pg. 158-159 on the book Systems Programming by John Donovan