rwhod(1M)rwhod(1M)NAMErwhod - system status server
SYNOPSISDESCRIPTION
is the server that maintains the database used by and (see rwho(1) and
ruptime(1)). sends status information to and receives status informa‐
tion from other nodes on the local network that are running
is started at system boot time if the RWHOD variable is set to 1 in the
file
As an information sender, it periodically queries the state of the sys‐
tem and constructs status messages that are broadcast on a network.
As an information receiver, it listens for other servers' status mes‐
sages, validates them, then records them in a collection of files
located in the directory.
By default, both sends and receives information. also supports the
following options:
Configures server to be an information sender only.
Configures server to be an information receiver only.
Status messages are generated approximately once every three minutes.
transmits and receives messages at the port indicated in the service
specification (see services(4)). The messages sent and received, are
of the form:
All fields are converted to network byte order before transmission.
System load averages are calculated from the number of jobs in the run
queue over the last 1-, 5- and 15-minute intervals. The host name
included is the one returned by the system call (see gethostname(2)).
The array at the end of the message contains information about the
users logged in on the sending machine. This information includes the
contents of the entry for each non-idle terminal line and a value indi‐
cating the time since a character was last received on the terminal
line (see utmp(4)).
discards received messages if they did originate at a server's port, or
if the host's name, as specified in the message, contains any unprint‐
able ASCII characters.
Valid messages received by are placed in files named in the directory.
These files contain only the most recent message in the format
described above.
WARNINGS
does not relay status information between networks. Users often incor‐
rectly interpret the server dying as a machine going down.
AUTHOR
was developed by the University of California, Berkeley.
FILES
Information about other machines.
SEE ALSOrwho(1), ruptime(1), gethostname (2), services (4), utmp (4).
rwhod(1M)
