Can we control this from a variable in the environment of the process?
Seems to me that the kernel shouldn't be setting the policy here
(although the kernel configurer can set it at build or load time)
and it's the job of cron or inetd to control the way subprocesses
dump core.
IMHO getting 'filename.core' is useful; instancing will add minor
usefulness (by keeping prior dumps around) and add a potential for
denial-of-service attack (by keeping prior dumps around). But that's
my opinion, YMMV. Configure it, by all means.
Nick.