为什么子进程还活着后，父进程在Linux中被打死？ [英] Why child process still alive after parent process was killed in Linux?

问题描述

有人告诉我，当你杀死在linux父进程，孩子会死。结果
但我对此表示怀疑。所以我写了两篇的bash脚本，其中 father.sh 将调用 child.sh

Someone told me that when you killed a parent process in linux, the child would die.
But I doubt it. So I wrote two bash scripts, where father.shwould invoke child.sh

下面是我的脚本：

现在我跑庆典father.sh ，你可以检查它 PS -alf

Now I run bash father.sh, you could check it ps -alf

然后我杀了 father.sh 按杀-9 24588 ，我猜子进程应该是终止，但不幸的是我错了。

Then I killed the father.sh by kill -9 24588, and I guessed the child process should be terminated but unfortunately I was wrong.

谁能解释一下为什么？

Could anyone explain why?

THX

推荐答案

没有，当你独自一人杀死一个过程，它不会杀死孩子。

No, when you kill a process alone, it will not kill the children.

您必须将信号发送到的进程组的，如果你想为一个给定组的所有进程，接收信号

You have to send the signal to the process group if you want all processes for a given group to receive the signal

kill -9 -parentpid

否则，孤儿将被链接到的init ，就表明了你的第三个屏幕截图（儿童的PPID已经成为1）。

Otherwise, orphans will be linked to init, as shown by your third screenshot (PPID of the child has become 1).

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