Re: proced: ppid of process ID 0 can be 0

[Eli Zaretskii]

> From: Stefan Monnier <address@hidden>
> Cc: address@hidden,  address@hidden,  address@hidden
> Date: Tue, 23 Dec 2008 09:44:29 -0500
> 
> >> Indeed, it should be in system-process-attributes which is already
> >> OS-dependent.
> > If you mean by having no ppid attribute, then that's ambiguous, since
> > an attribute can be missing because it is inaccessible for some
> > reason, like some kind of failure unrelated to the fact that the
> > process is really a root of a tree.
> 
> Seems very hypothetical.

It's not hypothetical, I've seen such cases and reported them to
Roland.

> More to the point: even if we could distinguish the "no ppid" from
> "unkown ppid", it's unclear how Elisp code could make use of it.

Lisp code cannot, but a primitive written in C can.

But we are repeating ourselves.