Andrei Budnik created MESOS-8037:
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Summary: ns::clone should spawn process, which is a direct child
Key: MESOS-8037
URL: https://issues.apache.org/jira/browse/MESOS-8037
Project: Mesos
Issue Type: Improvement
Reporter: Andrei Budnik
`ns::clone` does double-fork in order to be able to enter given PID namespace
and returns grandchild's pid, which is not a direct child of a parent process,
hence parent process can not retrieve status of an exited grandchild process.
As second fork is implemented via `os::clone`, we can pass `CLONE_PARENT` flag.
Also, we have to handle both intermediate child process and grandchild process
to avoid zombies.
Motivation behind this improvement is that both `docker exec` and `LXC attach`
can enter process' PID namespace, while still controlling child's status code.
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