Are child processes created with fork() automatica

问题:

I'm creating child processes with fork() in C/C++.
When the parent process ends (or is killed for some reason) I want all child processes to be killed as well.
Is that done automatically by the system? Or I have to do it myself?

Thanks.

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Pre-existing similar questions:

• How can I cause a child process to exit when the parent does?
• How to make child process die after parent exits?

回答1:

No. If the parent is killed, children become children of the init process (that has the process id 1 and is launched as the first user process by the kernel).

The init process checks periodically for new children, and waits for them (thus freeing resources that are allocated by their return value).

The question was already discussed with quality answers here: How to make child process die after parent exits?