module DEBUGGER__::ForkInterceptor

def _fork
  return super unless defined?(SESSION) && SESSION.active?
  parent_hook, child_hook = __fork_setup_for_debugger
  super.tap do |pid|
    if pid != 0
      # after fork: parent
      parent_hook.call pid
    else
      # after fork: child
      child_hook.call
    end
  end
end