Re: [PATCH v1 1/2] proc: get process file descriptor from /proc/<pid>

On Mon, Nov 19, 2018 at 2:33 AM Christian Brauner [off-list ref] wrote:

With this patch an open() call on /proc/<pid> will give userspace a handle
to struct pid of the process associated with /proc/<pid>. This allows to
maintain a stable handle on a process.
I have been discussing various approaches extensively during technical
conferences this year culminating in a long argument with Eric at Linux
Plumbers. The general consensus was that having a handle on a process
should be something that is very simple and easy to maintain with the
option of being extensible via a more advanced api if the need arises. I
believe that this patch is the most simple, dumb, and therefore
maintainable solution.

How does the mechanism you're adding here differ from proc_pid()?