Congratulations, you've basically reinvented pidfd. But notice that the Sixth Edition didn't yet have "select", so they had to invent a separate, non-fd kind o

Congratulations, you've basically reinvented pidfd. But notice that the Sixth Edition didn't yet have "select", so they had to invent a separate, non-fd kind of entity to track the processes and a separate syscall to both check the process status and to free the tracking entity.