prg@mgweed.UUCP (Gunsul) (02/02/91)
In article <1991Feb1.071518.6219@apt.bungi.com>, brian@apt.bungi.com (Brian Litzinger) writes:
< I have this wonderful Elgar backup power supply that can tell
< my UNIX System (ISC 2.0.2 System V.3.2) that the power has
< gone out.
<
< So I'd like some daemon to do an '/etc/init 0' when this happens.
<
< I've written a daemon called 'pwatchd' which does just this when
< it is sure the power is out. However, 'init' just says:
<
< init must be run from the console
<
< So what do I have to do to get init to do what I want rather
< than what it thinks is best?
<
< Help! Thanks in advance.
<
< -brian
< brian@apt.bungi.com
We have a 'C' program here that will monitor the power and calculate
if the computer should shut down. It does a 'system' call when it's
ready to quit. You might try putting this in your (I assume!) shell script..
cd /; /etc/shutdown -y -g10 -i0
Philmike (Michael Stefanik) (02/03/91)
In an article, apt.bungi.com!brian (Brian Litzinger) writes: >I've written a daemon called 'pwatchd' which does just this when >it is sure the power is out. However, 'init' just says: > > init must be run from the console > >So what do I have to do to get init to do what I want rather >than what it thinks is best? You change runlevel by sending an appropriate signal to the init process, not by invoking another one. The "appropriate" signal can vary from system to system, so you'll need to check out your manual pages on INIT to proceed along this path. However, why not simply do something like this: sync; sleep 2; /etc/haltsys Some may argue that it's crude, but I rather like it. -- Michael Stefanik | Opinions stated are not even my own. Systems Engineer, Briareus Corporation | UUCP: ...!uunet!bria!mike ------------------------------------------------------------------------------- technoignorami (tek'no-ig'no-ram`i) a group of individuals that are constantly found to be saying things like "Well, it works on my DOS machine ..."
fenk@sequent.UUCP (John Fenk) (02/05/91)
In article <1991Feb1.071518.6219@apt.bungi.com> brian@apt.bungi.com (Brian Litzinger) writes: >I have this wonderful Elgar backup power supply that can tell >my UNIX System (ISC 2.0.2 System V.3.2) that the power has >gone out. > >So I'd like some daemon to do an '/etc/init 0' when this happens. > >I've written a daemon called 'pwatchd' which does just this when >it is sure the power is out. However, 'init' just says: > > init must be run from the console > >So what do I have to do to get init to do what I want rather >than what it thinks is best? There have been several suggestions regarding this question. Someone suggested using shutdown. Some systems require shutdown to be run from the console. Someone else suggested using the haltsys command. I would not suggest using haltsys (on the systems that have it) except in an emergency. On the systems that I am familiar with haltsys does not unmount filesystems and do other cleanups before shutting down. I suggest: /etc/init 0 </dev/console This should fool init into thinking it is running from the console. It has worked for me on several different systems. You could also just send the right signal to the init process, but why bother figuring out what that is when a command has been provided for the purpose. John Fenk Sequent Computer Systems, Inc. fenk@sequent.com