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Asked: 2026-06-07T09:27:29+00:00

I’m using Ruby 1.9.2-p180 on Ubuntu 12.04. I don’t understand why the following code

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I’m using Ruby 1.9.2-p180 on Ubuntu 12.04. I don’t understand why the following code doesn’t work. The expected behaviour is that I should see the text: “TRAPPED” on my screen when I run the code, and the program should terminate. But the ruby program doesn’t terminate when I run it and nothing is printed on the screen. What am I missing?

pid = fork do                                                                  
  exec "trap 'echo TRAPPED' TERM; while :; do :; done"       
end                                                                           
Process.kill("TERM", pid)                                                      
Process.wait(pid)
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1 Answer

  1. Editorial Team

    The reason why it did not work as expected was that the kill was delivered before the exec commenced. Introducing a little sleep before delivering the kill ensures that the program will behave as expected.

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