Kill a Ruby child process when another Ruby child process has completed

Question

I'm trying to use Ruby to write a script to run monkey test on the Android app. I'm stuck with 1.8 Ruby and can't use spawn.

See below code for detail. For some reasons, the logcat process will continue to run even after the monkey process has completed. I had used Process.wait() for wait for monkey process to completed before killing the logcat process, but it doesn't kill it. Am I not using the fork properly?

Thanks.

pid_logcat = fork do
    puts "Enter capturing logcat"
    system("adb shell logcat | tee logcat.log")
end

pid_monkey = fork do
    puts "Running monkey script"
    system("adb shell monkey -p TestApp --throttle 200 -v 1000000 | tee Monkeylog.txt")
end


Process.wait(pid_monkey)
Process.kill("KILL", pid_logcat)

EDITED 1

I can confirm that adb does spawn another process which is outside of ruby's control, what should I do now? Process.kill('HUP', -Process.getpgid(pid_logcat)) won't work because that will kill the parent process too (the ruby process forking this)

EDITED 2 exec() also doesn't seem to work on pid_logcat forked process.

Answer 1

Just add Process.wait(pid_logcat) after your code.