gwyn@Brl@sri-unix (09/17/82)
From: Doug Gwyn <gwyn@Brl> 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).