UPS monitor daemon part 1 of 1
Greg A. Woods
woods at eci386.uucp
Fri Apr 12 01:54:16 AEST 1991
[BTW, just as a reminder for people who post sources to alt.sources:
Please set the "Followup-To:" header to alt.sources.d.]
In article <1991Apr03.095011.9609 at pilikia.pegasus.com> root at pilikia.pegasus.com (Art Neilson) writes:
> The UPS monitor daemon or "upsd" watches the serial port
> connected to an UPS and will perform an unattended shutdown
> of the system if the UPS is on battery longer than a specified
> number of minutes.
Neat-oh. How about a feature that can calculate the total time down
and the average charging time, and thus be able to figure out how long
the battery will last? I've seen this in a couple of commercial pgms.
>[....]
> echo shar: Extracting \"'README'\" \(3910 characters\)
> sed "s/^X//" >'README' <<'END_OF_FILE'
> X Tue Apr 02 23:24:20 HST 1991 art at pilikia.pegasus.com Pg. 1
>[....]
> X usage: upsd [-d tty][-c cmd][-l log][-t min]
> X -d tty pathname of UPS device
> X -c cmd pathname of shutdown command
> X -l log pathname of UPS log file
> X -t min delay time in minutes
.[....]
> X The -c cmd option specifies the full pathname of the command
> X to be executed to shut down the system. This command must
> X be enclosed in quotes if it consists of 2 or more words.
A more elegant solution for System V is to just sent a SIGPWR to init,
i.e. kill(1, SIGPWR); and have your inittab configured correctly to
"do the right thing" with powerfail (and/or powerwait) entries. Why
waste all that code which was put there for just this feature?
/etc/shutdown scripts are for human users, and can vary widely -- some
even ask for confirmation! Not something the average daemon can answer!
Init is also smart about what it does with powerfail and powerwait
depending upon the current run-level, thus even if you are in
single-user mode, it can, for example, be configured to run 'sync'
and/or uadmin to halt the kernel.
--
Greg A. Woods
woods@{eci386,gate,robohack,ontmoh,tmsoft}.UUCP ECI and UniForum Canada
+1-416-443-1734 [h] +1-416-595-5425 [w] VE3TCP Toronto, Ontario CANADA
Political speech and writing are largely the defense of the indefensible-ORWELL
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