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rubynohup

Is it possible to ignore SIGHUP in Ruby?

I want to create a Ruby script, which will start like this:

$ ruby script.rb &

Then, I will close the console and it must stay alive, working in the background. At the moment I have to run it like this, in order to achive that:

$ nohup ruby script.rb &

I want to get rid of nohup and deal with SIGHUP directly inside the script -- simply ignore it. Is it possible?

Solution

  • Sure, just Signal.trap HUP signal:

    def do_fork
  $pid = fork do
    Signal.trap("HUP") do
      puts "Received HUP, ignoring..."
    end
    Signal.trap("TERM") do
      puts "Received TERM, terminating..."
      exit(0)
    end
    while true do sleep(10_000) end
  end

  Process.detach($pid)
end

do_fork

    Copy the code above to some file and run it with ruby file.rb to see it ignores kill -HUP pid and closes on kill -TERM pid.