#! /bin/sh # @(#)do_demo 1.7 11/5/91 ERL # This script starts up a specific demo. A crude file locking # technique is used to reduce the probability that more than one # demo is run at the same time. NOTE: the existence and name of # this lock file is also exploited in the script edemos.sh # Arguments: # $1 = temp directory # $2 = demo directory demo_temp=$1 demo_dir=$2 # create temp directory if necessary, check that it is writable if test ! -d $demo_temp then mkdir $demo_temp 2> /dev/null fi touch $demo_temp/foo.$$ 2> /dev/null if test -f $demo_temp/foo.$$ then rm $demo_temp/foo.$$ else echo "$0($2): can't create $demo_temp or can't write in it; exiting. " exit 1 fi # check demo lock file lockfile=$demo_temp/demo.lock message=$demo_temp/errormess if [ -f $lockfile ]; then rm -f $message cat > $message Cannot run $demo_dir demo because it appears that another demo is running. If not, then please "rm $lockfile". EOF xtext -Wp 0 0 -t "DEMO ERROR" -F $message & exit 1 fi # Some demos require that scripts know where the temp directory is # so we put its name in a temp file in the user's home directory rm -f $HOME/.demo_temp echo $demo_temp > $HOME/.demo_temp # Now, we create the lockfile and invoke the demo touch $lockfile cd $demo_dir echo "" echo "Running Entropic demo: $demo_dir" ./rundemo $demo_temp rm -f $lockfile
