non-root process and PID files

[Nielsen]

Christopher Vance wrote:
> May I suggest a different feature: the ability to mark an open file
> (not just its fd) 'remove on close', with permission checked at mark
> time rather than close time (this status forgotten if not permitted
> when set) and the unlink actually done at close time only if the file
> has exactly one link and one open file instance at that time.

WinNT (2K etc...) has this capability. Not saying that this makes it a 
good idea though.

Nate