As Jan noted, there is a nice script available, checkrestart, to check exactly what services need to be restarted. You can use it after any software update. Very useful!
I would not like an automatic restart of services. This would lead to unexpected results.
Like for the libc6 update you mentioned. This update has so many dependencies that a very large number of services will need to be restarted - you don't want that to happen automatically. In fact, in this specific case, I believe the only reliable method to ensure a proper restart of all dependencies is a full system reboot. This is also what Debian recommends.
Datum: Fri, 30 Jan 2015 07:15:07 +0100 (CET)
Afzender: Isidor Zeuner <email@example.com>
Onderwerp: restarting services
I hope this is the right list to ask about this.
Using Debian-LTS, acquiring a patched libc6 to fix CVE-2015-0235
worked like a charm.
However, I wondered if it wouldn't be appropriate to have the
upgrade restart the services which link to libc6? Otherwise, running
services would still be vulnerable after the upgrade.
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