#!/bin/sh
set -e

kill_child_jobs() {
    echo "In kill_child_jobs()..."
    # Workaround for https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=482999
    tmp="$(mktemp)"
    jobs -p > "$tmp"
    child_pids=$(cat "$tmp")
    for child in $child_pids
    do
        # From https://unix.stackexchange.com/a/574169
        if [ -n "${child##*[!0-9]*}" ]
        then
            echo Killing "$child"
            # From https://stackoverflow.com/a/11231970
            kill "$child" || true
        fi
    done

    # zsh version from https://stackoverflow.com/a/36354483
    # zsh doesn't have jobs -p
    jobs > "$tmp"
    cat "$tmp"
    <"$tmp" sed --regexp-extended --quiet 's/\[([[:digit:]]+)\].*running.*/%\1/gp' | while read -r child
    do
        echo Killing job "$child"
        kill "$child" || true
    done

    rm "$tmp"
}
cleanup() {
    kill_child_jobs
}

# From https://unix.stackexchange.com/a/240736
for sig in INT QUIT HUP TERM; do
  trap "
    cleanup
    trap - $sig EXIT
    kill -s $sig "'"$$"' "$sig"
done
trap cleanup EXIT

yes aa &
yes disowned & builtin disown || true
sleep 100 &

wait