Index for Section 8

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rwhod(8)
NAME
  rwhod - The system status server

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

OPTIONS
  -b  Sets the broadcast only mode.  Sends outgoing rwho packets, but ignores
      incoming ones.

  -l  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 gethostname(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 originated
  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 operating.

FILES
  /usr/sbin/rwhod
      Specifies the command path

  /var/rwho/whod.hostname
      Contains the most recent valid message received by rwhod from hostname.

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

Index for Section 8

Alphabetical listing for R

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