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+.\"	$OpenBSD: rpc.statd.8,v 1.3 2017/10/17 22:47:58 schwarze Exp $
+.\"
+.\" Copyright (c) 1995 A.R.Gordon, andrew.gordon@net-tel.co.uk
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"
+.Dd $Mdocdate: October 17 2017 $
+.Dt RPC.STATD 8
+.Os
+.Sh NAME
+.Nm rpc.statd
+.Nd host status monitoring daemon
+.Sh SYNOPSIS
+.Nm
+.Op Fl d
+.Sh DESCRIPTION
+.Nm
+is a daemon which co-operates with rpc.statd daemons on other hosts to provide
+a status monitoring service.
+The daemon accepts requests from
+programs running on the local host (typically,
+.Xr rpc.lockd 8 ,
+the NFS file locking daemon) to monitor the status of specified hosts.
+If a monitored host crashes and restarts, the remote daemon will
+notify the local daemon, which in turn will notify the local program(s)
+which requested the monitoring service.
+Conversely if this host crashes and restarts when
+.Nm
+restarts, it will notify all of the hosts which were being monitored
+at the time of the crash.
+.Pp
+The options available are:
+.Bl -tag -width Ds
+.It Fl d
+Causes debugging information to be written to
+.Xr syslog 3 ,
+recording all RPC transactions to the daemon.
+These messages are logged with level
+.Dv LOG_DEBUG
+and facility
+.Dv LOG_DAEMON .
+Error conditions are logged irrespective of this option, using level
+.Dv LOG_ERR .
+.El
+.Pp
+The
+.Nm
+daemon must NOT be invoked by
+.Xr inetd 8
+because the protocol assumes that the daemon will run from system start time.
+Instead, it should be configured in
+.Xr rc.conf 8
+to run at system startup.
+.Sh FILES
+.Bl -tag -width /usr/include/rpcsvc/sm_inter.x -compact
+.It Pa /usr/include/rpcsvc/sm_inter.x
+RPC protocol specification used by local applications
+to register monitoring requests.
+.It Pa /var/db/statd.status
+Non-volatile record of currently monitored hosts.
+.El
+.Sh SEE ALSO
+.Xr syslog 3 ,
+.Xr rc.conf 8 ,
+.Xr rpc.lockd 8
+.Sh STANDARDS
+This implementation is based on the specification in
+the X/Open CAE Specification C218,
+"Protocols for X/Open PC Interworking: XNFS, Issue 4",
+ISBN 1 872630 66 9.
+.Sh HISTORY
+A version of
+.Nm
+appeared in SunOS 4.
+The current implementation was ported from
+.Nx
+to
+.Ox 4.4 .
+.Sh BUGS
+There is no means for the daemon to tell when a monitored host has
+disappeared permanently (e.g. catastrophic hardware failure), as opposed
+to transient failure of the host or an intermediate router.
+At present,
+it will retry notification attempts at frequent intervals for 10 minutes,
+then hourly, and finally gives up after 24 hours.
+.Pp
+The protocol requires that symmetric monitor requests are made to both
+the local and remote daemon in order to establish a monitored relationship.
+This is convenient for the NFS locking protocol, but probably reduces the
+usefulness of the monitoring system for other applications.
+.Pp
+The current implementation uses more than 1Kbyte per monitored host in
+the status file (and also in VM).
+This may be inefficient for NFS servers
+with large numbers of clients.