[Bug libc/6399] gettid() should have a wrapper

["mtk.manpages at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=6399

--- Comment #19 from Michael Kerrisk <mtk.manpages at gmail dot com> 2013-02-09 23:04:20 UTC ---
(In reply to comment #18)
> I still maintain that it's a broken design for setns to change the caller's
> pid. A pid is a fundamentally invariant property of a process.

Rich, 

I think what you mean is: "this is the way it's always been done". But this was
not handed to us on stone tablets. Linux has already changed a lot of old
assumptions in favor useful innovations. We can argue endlessly about whether
or not the alternative that I talked about it is a broken design. I'm actually
fairly agnostic on that point, but my bottom line point is that glibc
effectively imposed policy on kernel user space (i.e., "PIDs are invariant"),
and I think that was A Bad Idea (TM) for a library that provides the
fundamental plumbing from user space to the kernel.

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