Re: [PATCH] samples: make pidfd-metadata fail gracefully on older kernels

On Sun, Jun 23, 2019 at 02:32:30PM +0300, Dmitry V. Levin wrote:

On Sat, Jun 22, 2019 at 12:13:39AM +0200, Christian Brauner wrote:
[...]

quoted

Out of curiosity: what makes the new flag different than say
CLONE_NEWCGROUP or any new clone flag that got introduced?
CLONE_NEWCGROUP too would not be detectable apart from the method I gave
you above; same for other clone flags. Why are you so keen on being able
to detect this flag when other flags didn't seem to matter that much.

I wasn't following uapi changes closely enough those days. ;)

(Seriously, you had one job. :) I'm joking of course.)

What you want makes sense to me overall. This way userspace can decide
easier whether to manage a process through a pidfd or needs to fallback
to a pid.

Christian