FreeBSD-5.3/lib/libc/posix1e/mac_free.3

.\" Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
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.\" 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.
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.\" $FreeBSD: src/lib/libc/posix1e/mac_free.3,v 1.6 2003/08/22 18:01:03 rwatson Exp $
.\"
.Dd December 21, 2001
.Dt MAC_FREE 3
.Os
.Sh NAME
.Nm mac_free
.Nd free MAC label
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/mac.h
.Ft int
.Fn mac_free "mac_t label"
.Sh DESCRIPTION
The
.Fn mac_free
function frees the storage allocated to contain a
.Vt mac_t .
.Sh RETURN VALUES
The
.Fn mac_free
function always returns 0.
WARNING: see the notes in the
.Sx BUGS
section regarding the use of this
function.
.Sh SEE ALSO
.Xr mac 3 ,
.Xr mac_get 3 ,
.Xr mac_prepare 3 ,
.Xr mac_set 3 ,
.Xr mac_text 3 ,
.Xr mac 4 ,
.Xr mac 9
.Sh STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
Discussion of the draft
continues on the cross-platform POSIX.1e implementation mailing list.
To join this list, see the
.Fx
POSIX.1e implementation page
for more information.
.Sh HISTORY
Support for Mandatory Access Control was introduced in
.Fx 5.0
as part of the
.Tn TrustedBSD
Project.
.Sh BUGS
POSIX.1e specifies that
.Fn mac_free
will be used to free text strings created using
.Xr mac_to_text 3 .
Because
.Vt mac_t
is a complex structure in the
.Tn TrustedBSD
implementation,
.Fn mac_free
is specific to that type, and must not be used to free the character
strings returned from
.Fn mac_to_text .
Doing so may result in undefined behavior,
including application failure.