Re: [PATCH] pidfd: add ioctl to retrieve pid info

[Oleg Nesterov]

On 10/04, Luca Boccassi wrote:
>
> On Fri, 4 Oct 2024 at 20:30, Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
> >
> > I guess Christian meant you should simply use
> >
> >                 info.pid = task_pid_vnr(task);
> >
> > task_pid_vnr(task) returns the task's pid in the caller's namespace.
>
> Ah I see, I didn't realize there was a difference, sent v3 with the
> suggested change just now, thanks.

I didn't get v3, I guess I wasn't cc'ed again.

So, just in case, let me add that task_pid_vnr(task) can return 0 if
this task exits after get_pid_task().

Perhaps this is fine, I do not know. But perhaps you should actually
use pid_vnr(pid).

Oleg.