为什么在Linux中杀死父进程后子进程还活着? [英] Why child process still alive after parent process was killed in Linux?

问题描述

有人告诉我，当你在 linux 中杀死一个父进程时，子进程就会死亡.
但我对此表示怀疑.所以我写了两个 bash 脚本，其中 father.sh 会调用 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

这是我的脚本:

现在我运行bashfather.sh，你可以查看ps -alf

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

然后我通过kill -9 24588杀死了father.sh，我猜子进程应该被终止，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?

谢谢

推荐答案

不，当你单独杀死一个进程时，它不会杀死孩子.

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

如果您希望给定组的所有进程都接收信号，则必须将信号发送到进程组

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

例如，如果您的父进程 ID 的代码为 1234，则您必须指定 parentpid，添加符号减号，后跟您的父进程 ID:

For example, if your parent process id has the code 1234, you will have to specify the parentpid adding the symbol minus followed by your parent process id:

kill -9 -1234

否则，孤儿将链接到 init，如您的第三个屏幕截图所示(孩子的 PPID 已变为 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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