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- GACUPS is a NeXTstep program for monitoring a Best Fortress
- Uninterruptible Power Supply (UPS). It was written at Gustavus
- Adolphus College (GAC) by Max Hailperin <max@nic.gac.edu> on August
- the 12th, 1993. It is in the public domain and utterly without
- warranty. I would, however, appreciate hearing of any improvements.
-
- This program has only been tested under NeXTstep 2.x, not 3.x.
-
- To build the program, you should be able to just say "make".
-
- There are actually two separate programs: GACUPS and GACUPS.daemon
-
- GACUPS.daemon should be run from the /etc/rc.local bootup script on
- the NeXT to which the UPS is attached (see below regarding cabling).
- It should be given the name of the serial device (/dev/ttya or
- /dev/ttyb) as a command-line argument. Its responsibility is to
- handle the communication with the UPS, to provide syslog messages when
- there is a power outage, and to provide graceful shutdown when the
- battery runs low. In all these regards it is quite similar to Best's
- own "CheckUPS" program. The only major functional difference is that
- it also listens for information requests from the GACUPS program.
-
- GACUPS is a user-interface application, which you might want to
- install in /LocalApps, for example. It can be run on any NeXT on the
- network, not just the one on which GACUPS.daemon is running. It
- connects over the network to the GACUPS.daemon in order to get
- information about the UPS's status, which it displays. The first time
- you run it you'll need to supply the hostname to which it should
- connect, if it isn't the localhost; thereafter it will start up with
- the same hostname as the previous use.
-
- Hardware:
- The correct cable wiring is as follows:
- UPS (DB-9 male) NeXT (Mini DIN-8 male)
- --------------- ----------------------
- 1 3
- 2 5
- 4 4
-
- Security:
- If you don't make the protection modes on /dev/ttya (or /dev/ttyb;
- whichever you plug the UPS into; I'll assume a) more restrictive,
- then any normal user, even logging in remotely, will be able to
- power your machine down by just sending the right string to that
- serial port. So, I'd recommend making that device accessible only to
- root. In fact, I'd go further and do the same for all the various
- flow controlled and dial in/out variations on tty, i.e.
- /dev/{tty{d,},cu}{f,}a
-