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Concurrent feature tests for elixir
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priv/run_phantom.sh
#!/bin/sh
#
# Wrapper script to start an external program and terminate it when it either
# receives a SIGINT, SIGHUP, or SIGTERM or when STDIN closes. This script also
# waits until all child processes have exited before exiting, so when the script
# ends, we can be sure all started programs have finished.
#
set -e
create_pipe(){
local pipe=$(mktemp -u)
mkfifo -m 600 "$pipe"
echo $pipe
}
remove_pipe(){
rm -f $1
}
wait_for_stdin_close(){
while read line ; do
:
done
}
wait_for_pids_to_exit(){
pids="$@"
for pid in $pids; do
while kill -0 $pid 2>/dev/null; do
sleep 0.1
done
done
}
shutdown(){
local my_pid=$1
local program_pid=$2
children=$(ps xao pid,pgid | grep $my_pid | awk '{print $1}' | grep -v $my_pid)
kill $program_pid 2>/dev/null
wait_for_pids_to_exit $children
exit 0
}
# Start the program in a subshell so we can wait until it ends and then kill
# this wrapper script. In order to communicate the pid up to the parent process
# we need to use a fifo pipe.
my_pid=$$
pid_pipe=$(create_pipe)
trap 'remove_pipe "$pid_pipe"' EXIT
(
"$@" &
echo $! >> $pid_pipe
wait 2>/dev/null
kill $my_pid
) &
read program_pid < "$pid_pipe"
echo "PID: $program_pid"
trap 'shutdown $my_pid $program_pid' INT HUP TERM
remove_pipe $pid_pipe
# Start shutdown process if stdin is closed
wait_for_stdin_close
shutdown $my_pid $program_pid