fake_daemon.sh

#!/bin/bash

numeric_or_default() {
    local -i val="$1"
    local -i default="$2"
    if [[ "$1" == "$val" ]]; then
        echo "$val"
    else
        echo "$default"
    fi
}

declare -i fake_daemon_die_timeout_secs
fake_daemon_die_timeout_secs="$(numeric_or_default "$fake_daemon_die_timeout_secs" "0")"

declare -i fake_daemon_exit_code
fake_daemon_exit_code="$(numeric_or_default "$fake_daemon_exit_code" "0")"

fake_daemon_dying="${fake_daemon_dying:-false}"

loop=true

declare -i run_time
run_time=0

got_signal() {
    echo "got signal"
    if [[ "$fake_daemon_dying" == "false" ]]; then
        fake_daemon_dying=true
    else
        loop=false
    fi
}

trap 'got_signal' INT TERM

while [[ "$loop" == "true" && ! ( "$fake_daemon_dying" == "true" && "$fake_daemon_die_timeout_secs" == 0 ) ]]; do
    echo "$run_time"
    (( run_time++ ))

    sleep 1

    [[ "$fake_daemon_dying" == "true" ]] \
        && (( fake_daemon_die_timeout_secs-- ))
done

exit "$fake_daemon_exit_code"

test.sh

#!/bin/bash

echo "should take about 0 seconds with exit code 0"
time env fake_daemon_dying=true ./fake_daemon.sh
echo "exit code: $?"

echo
echo "should take about 3 seconds with exit code 5"
time env fake_daemon_dying=true fake_daemon_die_timeout_secs=3 fake_daemon_exit_code=5 ./fake_daemon.sh
echo "exit code: $?"

echo
echo "should die about 3 seconds after ^C with exit code 7"
time env fake_daemon_die_timeout_secs=3 fake_daemon_exit_code=7 ./fake_daemon.sh
echo "exit code: $?"