.\" Copyright (c) 2002 Networks Associates Technology, Inc.
.\" All rights reserved.
.\"
.\" This software was developed for the FreeBSD Project by Chris
.\" Costello at Safeport Network Services and NAI Labs, the Security
.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
.\" research program.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    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.
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" $FreeBSD$
.\"
.Dd July 7, 2006
.Dt MAC_IS_PRESENT 3
.Os
.Sh NAME
.Nm mac_is_present
.Nd report whether the running system has MAC support
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/mac.h
.Ft int
.Fn mac_is_present "const char *policyname"
.Sh DESCRIPTION
The
.Fn mac_is_present
function determines whether the currently-running kernel supports MAC for
a given policy or not.
If
.Fa policyname
is
.Pf non- Dv NULL ,
the presence of the named policy
(e.g.\&
.Dq Li biba ,
.Dq Li mls ,
.Dq Li te )
is checked, otherwise the presence of any MAC policies at all is checked.
.Sh RETURN VALUES
If the system supports the given MAC policy, the value 1 is returned.
If the specified MAC policy is not supported, the value 0 is returned.
If an error occurs, the value \-1 is returned.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er EINVAL
The value of
.Fa policyname
is not valid.
.It Bq Er ENOMEM
Insufficient memory was available to allocate internal storage.
.El
.Sh SEE ALSO
.Xr mac 3 ,
.Xr mac_free 3 ,
.Xr mac_get 3 ,
.Xr mac_prepare 3 ,
.Xr mac_set 3 ,
.Xr mac_text 3 ,
.Xr mac 4 ,
.Xr mac 9
.Sh HISTORY
Support for Mandatory Access Control was introduced in
.Fx 5.0
as part of the
.Tn TrustedBSD
Project.