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=== Assistant: 没错，哥们！用管道可以实现子进程主动通知父进程完成任务，这比单纯依赖 waitpid 更灵活，因为父进程可以实时获取子进程的状态或数据，而不仅仅是等待退出。 === 没错，哥们！用管道可以实现子进程主动通知父进程完成任务，这比单纯依赖 waitpid 更灵活，因为父进程可以实时获取子进程的状态或数据，而不仅仅是等待退出。 接下来问你一个关于信号的： SIGKILL 信号和 SIGTERM 信号有什么本质区别？为什么 SIGKILL 无法被捕捉或忽略？
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