为什么在信号陷阱块中被杀死的进程会变成僵尸,而不是定期终止?

如果我用 Process.new ,他们可能会被杀死 .kill .然而,它们在信号陷阱中变成了僵尸:

PROCESSES = {} of Int32 => Process

spawn {
  loop { sleep 1 }
}

spawn {
  x = Process.new("sleep", "100".split)
  x.kill
  sleep 0.4
  puts x.terminated?

  x = Process.new("sleep", "100".split)
  PROCESSES[x.pid] = x
}


Signal::INT.trap {
  Signal::INT.reset
  PROCESSES.each { |pid, x|
    puts "killing: #{pid}"
    x.kill
    sleep 1
    puts "killed #{pid}? #{x.terminated?}"
  }
}
sleep

使用 crystal run 并向进程发送一个SIGINT,将始终具有 .terminated? 为进程返回true,因为它位于僵尸中( <defunct> )州政府。