signal_test.rb

def exec
  pids = []
  pid = Process.fork do
    Exec.execve_override_procname(ENV.to_hash, "sleep", "/bin/sleep", "10")
  end
  pids << pid
  puts "sleep(pid: #{pid})"

  th = SignalThread.trap(:INT, {detailed:true}) do |info|
    puts "SIGINT pid: #{pid} siginfo.uid:#{info.uid} siginfo.pid:#{info.pid}"
    if info.pid.zero?
      begin
        puts Process.kill(:INT, *pids)
      rescue => e
        puts e
      end
    end
  end

  Process.wait2(pid)

  th.kill(:INT)
  th.cancel
end

SignalThread.trap(:KILL) do
  puts "SIGKILL"
end

exec
exec

#Thread.usleep(5000000)

実行ログ

❯ mruby signal_test.rb
sleep(pid: 239527)
^CSIGINT pid: 239527 siginfo.uid:0 siginfo.pid:0 🌟 一回目のSIGINTは飛ぶ
No such process - no such process
SIGINT pid: 239527 siginfo.uid:899402263 siginfo.pid:239525 🌟 スレッドの終了
sleep(pid: 239532)
^CSIGINT pid: 239532 siginfo.uid:0 siginfo.pid:0 🌟 二回目以降はなぜかSIGINTが飛ばない？
1
^CSIGINT pid: 239532 siginfo.uid:0 siginfo.pid:0
1
^CSIGINT pid: 239532 siginfo.uid:0 siginfo.pid:0
1