rwhod man page on OSF1

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rwhod(8)							      rwhod(8)

NAME
       rwhod - The system status server

SYNOPSIS
       /usr/sbin/rwhod [-b  | -l]

OPTIONS
       Sets the broadcast only mode.  Sends outgoing rwho packets, but ignores
       incoming ones.  Sets the listen	only  mode.   Collects	incoming  rwho
       packets from the network, but does not broadcast rwho data.

DESCRIPTION
       The  rwhod daemon is the server that maintains the database used by the
       rwho(1) and ruptime(1) programs.	 Its operation is  predicated  on  the
       ability to broadcast messages on a network.

       The  rwhod  server  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	 rwhod
       servers'	 status	 messages,  validating	them, then recording them in a
       collection of files located in the /var/rwho directory.

       The server transmits and receives messages at the port indicated in the
       rwho  service  specification;  see  services(4).	 The messages sent and
       received have the following format:

       struct  outmp {
	       char    out_line[8];	       /* tty name */
	       char    out_name[8];	       /* user id */
	       long    out_time;	       /* time on */ };

       struct  whod {
	       char    wd_vers;
	       char    wd_type;
	       char    wd_fill[2];
	       int     wd_sendtime;
	       int     wd_recvtime;
	       char    wd_hostname[32];
	       int     wd_loadav[3];
	       int     wd_boottime;
	       struct  whoent {
		       struct  outmp we_utmp;
		       int     we_idle;
	       } 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 w(1) program, and represent
       load averages over the 5-, 10-, and  15-minute  intervals  prior	 to  a
       server's transmission; they are multiplied by 100 for representation in
       an integer.  The hostname included is that  returned  by	 the  gethost‐
       name(2)	system	call, with any trailing domain name omitted. 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 utmp(4) entry for each nonidle terminal line and a value indicating
       the time in seconds since a character was last received on the terminal
       line.

       Messages received by the rwho server are discarded unless  they	origi‐
       nated  at  an  rwho 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 rwhod are placed
       in files named whod.hostname in the /var/rwho directory.	  These	 files
       contain	only  the  most	 recent	 message,  in  the  format  previously
       described.

       Status messages are  generated  approximately  once  every  3  minutes.
       rwhod performs an nlist(3) on /vmunix every 30 minutes to guard against
       the possibility that this file is not the system image currently	 oper‐
       ating.

FILES
       Specifies  the  command	path  Contains	the  most recent valid message
       received by rwhod from hostname.

SEE ALSO
       Commands: rwho(1), ruptime(1)

								      rwhod(8)
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