1.\" Copyright (c) 2002 Networks Associates Technology, Inc. 2.\" All rights reserved. 3.\" 4.\" This software was developed for the FreeBSD Project by Chris 5.\" Costello at Safeport Network Services and NAI Labs, the Security 6.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR 7.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS 8.\" research program. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" $FreeBSD$ 32.\" 33.Dd July 7, 2006 34.Dt MAC_IS_PRESENT 3 35.Os 36.Sh NAME 37.Nm mac_is_present 38.Nd report whether the running system has MAC support 39.Sh LIBRARY 40.Lb libc 41.Sh SYNOPSIS 42.In sys/mac.h 43.Ft int 44.Fn mac_is_present "const char *policyname" 45.Sh DESCRIPTION 46The 47.Fn mac_is_present 48function determines whether the currently-running kernel supports MAC for 49a given policy or not. 50If 51.Fa policyname 52is 53.Pf non- Dv NULL , 54the presence of the named policy 55(e.g.\& 56.Dq Li biba , 57.Dq Li mls , 58.Dq Li te ) 59is checked, otherwise the presence of any MAC policies at all is checked. 60.Sh RETURN VALUES 61If the system supports the given MAC policy, the value 1 is returned. 62If the specified MAC policy is not supported, the value 0 is returned. 63If an error occurs, the value \-1 is returned. 64.Sh ERRORS 65.Bl -tag -width Er 66.It Bq Er EINVAL 67The value of 68.Fa policyname 69is not valid. 70.It Bq Er ENOMEM 71Insufficient memory was available to allocate internal storage. 72.El 73.Sh SEE ALSO 74.Xr mac 3 , 75.Xr mac_free 3 , 76.Xr mac_get 3 , 77.Xr mac_prepare 3 , 78.Xr mac_set 3 , 79.Xr mac_text 3 , 80.Xr mac 4 , 81.Xr mac 9 82.Sh HISTORY 83Support for Mandatory Access Control was introduced in 84.Fx 5.0 85as part of the 86.Tn TrustedBSD 87Project. 88