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+.\" Copyright (c) 2008 Isilon Inc http://www.isilon.com/
+.\" Authors: Doug Rabson <dfr@rabson.org>
+.\" Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
+.\"
+.\" 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.
+.\"
+.\" 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.
+.\"
+.\" $FreeBSD$
+.Dd July 4, 2008
+.Dt RPC_GSS_SVC_MAX_DATA_LENGTH 3
+.Os
+.Sh NAME
+.Nm rpc_gss_svc_max_data_length
+.Nd "calculate maximum data size"
+.Sh LIBRARY
+.Lb librpcsec_gss
+.Sh SYNOPSIS
+.In rpc/rpcsec_gss.h
+.Ft int
+.Fn rpc_gss_svc_max_data_length "struct svc_req *req" "int max_tp_unit_len"
+.Sh DESCRIPTION
+Calculate the maximum message size that will fit into a packet of size
+.Fa max_tp_unit_len ,
+given the current service and QoP setting.
+.Sh PARAMETERS
+.Bl -tag
+.It req
+An RPC request
+.It max_tp_unit_len
+Maximum packet size of the underlying transport protocol
+.El
+.Sh RETURN VALUES
+The maximum message size that can be encoded
+.Sh SEE ALSO
+.Xr rpc 3 ,
+.Xr gssapi 3 ,
+.Xr rpcset_gss 3
+.Sh HISTORY
+The
+.Nm
+manual page example first appeared in
+.Fx 8.0 .
+.Sh AUTHORS
+This
+manual page was written by
+.An Doug Rabson Aq dfr@FreeBSD.org .