.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved. The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\" @(#)rwhod.8 6.1 (Berkeley) %G%
rwhod \- system status server
is the server which maintains the database used by the
programs. Its operation is predicated on the ability to
operates as both a producer and consumer of status information.
As a producer of information it periodically
queries the state of the system and constructs
status messages which are broadcast on a network.
As a consumer of information, it listens for other
servers' status messages, validating them, then recording
them in a collection of files located in the directory
server transmits and receives messages at the port indicated
in the ``rwho'' service specification, see
The messages sent and received, are of the form:
char out_line[8]; /* tty name */
char out_name[8]; /* user id */
long out_time; /* time on */
} wd_we[1024 / sizeof (struct whoent)];
All fields are converted to network byte order prior to
transmission. The load averages are as calculated by the
program, and represent load averages over the 5, 10, and 15 minute
intervals prior to a server's transmission. The host name
included is that returned by the
The array at the end of the message contains information about
the users logged in to the sending machine. This information
includes the contents of the
entry for each non-idle terminal line and a value indicating the
time since a character was last received on the terminal line.
server are discarded unless they originated at a
server's port. In addition, if the host's name, as specified
in the message, contains any unprintable ASCII characters, the
message is discarded. Valid messages received by
are placed in files named
These files contain only the most recent message, in the
Status messages are generated approximately once every
on /vmunix every 10 minutes to guard against
the possibility that this file is not the system
image currently operating.
Should relay status information between networks.
People often interpret the server dieing