rwhod for tops-20

[Satz at SRI-NIC.ARPA]

From:  Greg Satz <Satz at SRI-NIC.ARPA>

I just finished up an rwho daemon with the associated ruptime and rwho
user programs for TOPS-20.

For those of you who don't know what the rwho daemon does, let me
explain. 4.2bsd Unix has a daemon which runs in the background
transmitting and listening for broadcast UDP packets over an ethernet.
The packets contain information about particular systems, such as their
names, number of users, load averages, uptime as well as some info about
each user who is on the system at the time. At five minute intervals,
rwhod wakes up and sends out this information to other systems. rwhod
writes out this info into one file per host where rwho and ruptime can
read it. ruptime displays one line per system containing the system
name, number of users on, load averages, and uptime. rwho displays all
of the users on all of the systems.

Mike Muuss (mike at brl) made changes to the Unix rwho daemon to allow it
to send packets to hosts not on an ethernet. This allows agreeing
Internet sites to exchange user/host info.

My version for TOPS-20 can exchange rwho UDP packets with any 4.2bsd or
TOPS-20 site running the daemon. It utilizes Vince Fuller's UDP library
package for all UDP transactions. At startup, the daemon reads the file
SYSTEM:HOSTS.UDP for a list of hosts to send udp packets to. Each host
is on a separate line and A.B.C.D address are accepted. A version of the
user programs exist but aren't fully implemented. ruptime only outputs
hosts in alphabetical order. rwho just outputs users in the order they
are received in the packet. To be useful, it should sort the usernames
alphabetically like the unix version.

If anyone is interested in a copy of these programs, let me know.
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