Other than verifying pidfd based polling, the tests make sure that
wait semantics are preserved with the pidfd poll. Notably the 2 cases:
1. If a thread group leader exits while threads still there, then no
pidfd poll notifcation should happen.
2. If a non-thread group leader does an execve, then the thread group
leader is signaled to exit and is replaced with the execing thread
as the new leader, however the parent is not notified in this case.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Christian Brauner <christian@brauner.io>
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