pidfd design

[Joel Fernandes]

On Wed, Mar 20, 2019 at 07:51:57PM +0100, Christian Brauner wrote:
[snip]
> > > translate_pid() should just return you a pidfd. Having it return a pidfd
> > > and a status fd feels like stuffing too much functionality in there. If
> > > you're fine with it I'll finish prototyping what I had in mind. As I
> > > said in previous mails I'm already working on this.
> > 
> > translate_pid also needs to *accept* pidfds, at least optionally.
> > Unless you have a function from pidfd to pidfd, you race.
> 
> You're misunderstanding. Again, I said in my previous mails it should
> accept pidfds optionally as arguments, yes. But I don't want it to
> return the status fds that you previously wanted pidfd_wait() to return.
> I really want to see Joel's pidfd_wait() patchset and have more people
> review the actual code.

No problem, pidfd_wait is also fine with me and we can change it later to
translate_pid or something else if needed.

Agreed that lets get to some code writing now that (I hope) we are all on the
same page and discuss on actual code.

 - Joel