You can get a pidfd by opening /proc/$pid. That's all a pidfd is. The proposed p...

cyphar on Aug 3, 2019 | parent | context | favorite | on: Killing a process and all of its descendants

You can get a pidfd by opening /proc/$pid. That's all a pidfd is. The proposed pidfd_open(2) is for separate and more specialised use-cases where /proc isn't available and other restrictions apply.