Re: [PATCH] futex: Prevent robust futex exit race more

[Florian Weimer]

* Christian Brauner:

> Fwiw, I added unique inode numbers for the lifetime of the system to
> pidfds some time ago. The inode number is allocated for every struct pid
> and available via pid->ino. A pidfd can be stat()ed to retrieve it. Just
> mentioning it in case this may be useful.

Is there an efficient way to get this without allocating a file
descriptor, and without /proc being mounted?

Thanks,
Florian