Modified version of https://bugs.launchpad.net/upstart/+bug/406397/comments/47 to work with ubuntu sleep

upstart_fix_pid.sh

#!/bin/bash

# usage: bash /tmp/upstart_fix_pid.sh <pid>

sleep 0.001 &
firstPID=$!

# exhaust the pid space
while (( $! >= $firstPID ))
do
  sleep 0.001 &
done

# will use up to testPID inclusive, we want to use the next pid
declare -i testPID
testPID=$(($1 - 1))
while (( $! < $testPID ))
do
  sleep 0.001 &
done

# fork a background process then die so init reaps its pid
sleep 3 &
echo "Init will reap PID=$!"
kill -9 $$