library to run subprocesses in bash

runner.sh

#!/bin/bash
# Library which causes a bash script to block until killed, shutting down its
# child processes when complete.

function _death {
  echo "killing all subprocesses" 1>&2
  pkill -P $$
  exit 0  # still need to quit
}
trap _death SIGINT SIGTERM

function _runner {
  set -eu
  while true; do sleep 3600; done
}
trap _runner EXIT