On Tue, Jun 03, 2008 at 12:12:49PM -0700, Jordan Brown wrote: > One could imagine having a system call that did the final sync and set > the file systems read-only, or something like that, so that we could > have additional user-space involvement between the sync and the actual > final shutdown, but we don't have that.
Is there no way to do that now? (sync and remount -o ro, that is) If there is, then that may be a way to go: svc.startd would stop all services, killall, sync, remount -o ro, run pre-poweroff hooks, then uadmin(). > If we don't need to do the final sync before turning off the power, or > if we can arrange for userspace involvement after the final sync, then I > would hope that we could do all of the sequencing using SMF dependencies > rather than by putting additional hooks into svc.startd. Well, yes; that implies strict shutdown ordering, at least for the last one or two services. Jim, Asking that UPS vendors provide a way to delay poweroff seems unrealistic (unless they already provide it). As unrealistic as putting these hooks in the kernel seems to you. No, I don't use a UPS at home (other than my laptop battery :) Nico --
