What does docker-compose down do?

General
1

When I execute docker-compose down. What exactly it does to stop the services?

I want to know if it

  • sends SIGINT to each container’s 0-PID process?
  • sends SIGKILL to each container’s 0-PID process?
  • simply terminates the container regardless of its state?

I want to know this, because I want to write a startup.sh script that could stop the services in the container gracefully.