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I'm nitpicking, but is there a reason why you use the numeric signal number in Linux? On my machine "kill -SIGSTOP" works as expected, and I don't remember a time when you couldn't use signal names like that.

[jwilk]

Neither "kill -SIGSTOP" nor "kill -17" is portable. (In fact 17 is SIGCHLD on x86 Linux…)

You should use "kill -STOP".

[vermaden]

Fixed, thank you for pointing that.

[jwilk]

The blog post still uses "kill -17" and "kill -19".