From: utzoo!decvax!cca!gwyn@Brl@sri-unix
Newsgroups: net.unix-wizards
Title: Re:  getppid
Article-I.D.: sri-unix.3310
Posted: Thu Sep 16 22:48:59 1982
Received: Fri Sep 17 03:49:43 1982

From:     Doug Gwyn 
Date:     13 Sep 82 23:33:18-EDT (Mon)
getppid is documented under getpid(2).  It is implemented on a PDP-11
by having the parent PID returned in R1 on the getpid() system call
(a trivial update if your kernel doesn't do this).