Listing 1: Background monitor script

#!/bin/sh

#
# Command:   lock=<screenlock> monitor <secs> &
#
# Monitor keyboard and mouse activity and execute <screenlock> when no
# activity has occurred in the last <secs> seconds
#
# Calls:     <OS>_kbr for keyboard interrupts/counts
#            <OS>_msr for mouse interrupts/counts
#
# Note:      <OS> is the operating system as returned by uname
#
# Programmer: Doug Morris 1/17/96
#

# determine count routine names

os=`uname`
kbr=${os}_kbr
msr=${os}_msr

exit=N

# loop until terminated

while [ $exit = N ]
do

# get current keyboard & mouse activity counts

kbo=`$kbr`
mso=`$msr`

# sleep for specified period

sleep $1

# get updated keyboard & mouse activity counts

kbn=`$kbr`
msn=`$msr`

# if no keyboard or mouse activity occurred call <screenlock>

if [ $kbo -eq $kbn -a $mso -eq $msn ]
then $lock
fi
done

# End of File