rwhod(1M)																 rwhod(1M)

NAME

       rwhod - system status server

SYNOPSIS

DESCRIPTION

       is the server that maintains the database used by and (see rwho(1) and ruptime(1)).  sends status information to and receives status infor-
       mation 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 system and constructs status messages that are broadcast on a network.

       As an information receiver, it listens for other servers' status messages, 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 indicating 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
       unprintable 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 incorrectly interpret the server dying as a machine going down.

AUTHOR

       was developed by the University of California, Berkeley.

FILES

       Information about other machines.

SEE ALSO

       rwho(1), ruptime(1), gethostname(2), services(4), utmp(4).

																	 rwhod(1M)