NetBSD/usr.sbin/rwhod/rwhod.8

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.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
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.\" from: @(#)rwhod.8 8.2 (Berkeley) 12/11/93
.\" $NetBSD: rwhod.8,v 1.13 2003/08/07 11:25:43 agc Exp $
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.\"
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.Dd December 11, 1993
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.Dt RWHOD 8
.Os
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.Sh NAME
.Nm rwhod
.Nd system status server
.Sh SYNOPSIS
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.Nm
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.Sh DESCRIPTION
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.Nm
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is the server which maintains the database used by the
.Xr rwho 1
and
.Xr ruptime 1
programs. Its operation is predicated on the ability to
.Em broadcast
messages on a network.
.Pp
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.Nm
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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
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.Nm
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servers' status messages, validating them, then recording
them in a collection of files located in the directory
.Pa /var/rwho .
.Pp
The server transmits and receives messages at the port indicated
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in the ``who'' service specification; see
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.Xr services 5 .
The messages sent and received, are of the form:
.Bd -literal -offset indent
struct outmp {
char out_line[8]; /* tty name */
char out_name[8]; /* user id */
int32_t out_time; /* time on */
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};
struct whod {
char wd_vers;
char wd_type;
char wd_fill[2];
int32_t wd_sendtime;
int32_t wd_recvtime;
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char wd_hostname[32];
int32_t wd_loadav[3];
int32_t wd_boottime;
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struct whoent {
struct outmp we_utmp;
int32_t we_idle;
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} wd_we[1024 / sizeof (struct whoent)];
};
.Ed
.Pp
All fields are converted to network byte order prior to
transmission. The load averages are as calculated by the
.Xr w 1
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program, and represent load averages over the 5, 10, and 15 minute
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intervals prior to a server's transmission; they are multiplied by 100
for representation in an integer. The host name
included is that returned by the
.Xr gethostname 3
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function call, with any trailing domain name omitted.
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The array at the end of the message contains information about
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the users logged in to the sending machine. This information
includes the contents of the
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.Xr utmp 5
entry for each non-idle terminal line and a value indicating the
time in seconds since a character was last received on the terminal line.
.Pp
Messages received by the
.Xr rwho 1
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server are discarded unless they originated at an
rwho
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server's port. In addition, if the host's name, as specified
in the message, contains any unprintable
.Tn ASCII
characters, the
message is discarded. Valid messages received by
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.Nm
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are placed in files named
.Pa whod.hostname
in the directory
.Pa /var/rwho .
These files contain only the most recent message, in the
format described above.
.Pp
Status messages are generated approximately once every
3 minutes.
.Sh SEE ALSO
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.Xr ruptime 1 ,
.Xr rwho 1
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.2 .
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.Sh BUGS
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There should be a way to relay status information between networks.
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Status information should be sent only upon request rather than continuously.
People often interpret the server dying
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or network communication failures
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as a machine going down.