ruby - 用子进程杀死 ruby 中的 fork 进程

Question

以下代码 fork 主进程并在反引号中运行命令。脚本末尾的 kill 只会杀死 fork 进程，但不会杀死它的子进程(即 sleep 命令)。

pid = fork do
  Thread.new do
    `sleep 20`
  end
end
sleep(1)
Process.kill("HUP",pid)

除了搜索进程树之外，是否有办法杀死所有子进程(由 fork 进程中的线程中的反引号命令生成)？

Answer 1

Behind the scene both system and backtick operations use fork to fork the current process and then they execute the given operation using exec .

Since exec replaces the current process it does not return anything if the operation is a success. If the operation fails then `SystemCallError is raised.

http://blog.bigbinary.com/2012/10/18/backtick-system-exec-in-ruby.html