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+.\"-
+.\" Copyright (c) 2000 Robert N. M. Watson
+.\" 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.
+.\"
+.\" 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 January 28, 2000
+.Dt ACL_DUP 3
+.Os FreeBSD 4.0
+.Sh NAME
+.Nm acl_dup
+.Nd Duplicate an ACL
+.Sh SYNOPSIS
+.Fd #include <sys/types.h>
+.Fd #include <sys/acl.h>
+.Ft acl_t
+.Fn acl_dup "acl_t acl"
+.Sh DESCRIPTION
+The
+.Fn acl_dup
+function returns a pointer to a copy of the ACL pointed to by the argument
+.Va acl .
+
+This function may cause memory to be allocated.  Teh caller should free any
+releaseable memory, when the new ACL is no longer required, by calling
+.Xr acl_free 3
+with the
+.Va (void*)acl_t
+as an argument.
+
+Any existing ACL pointers that refer to the ACL referred to by
+.Va acl
+shall continue to refer to the ACL.
+.Sh IMPLEMENTATION NOTES
+FreeBSD's support for POSIX.1e interfaces and features is still under
+development at this time.
+.Sh RETURN VALUES
+Upon successful completion, this function shall return a pointer to the
+duplicate ACL.  Otherwise, a value of
+.Va (acl_t)NULL
+shall be returned, and
+.Va errno
+shall be set to indicate the error.
+.Sh ERRORS
+If any of the following conditions occur, the
+.Fn acl_init
+function shall return a value of
+.Va (acl_t)NULL
+and set
+.Va errno
+to the corresponding value:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+Argument
+.Va acl
+does not point to a valid ACL.
+.It Bq Er ENOMEM
+The
+.Va acl_t
+to be returned requires more memory than is allowed by the hardware or
+system-imposed memory management constraints.
+.El
+.Sh SEE ALSO
+.Xr acl 3 ,
+.Xr acl_free 3 ,
+.Xr acl_get 3 ,
+.Xr posix1e 3
+.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 FreeBSD POSIX.1e implementation
+page for more information.
+.Sh HISTORY
+POSIX.1e support was introduced in FreeBSD 4.0, and development continues.
+.Sh AUTHORS
+Robert N M Watson
+.Sh BUGS
+These features are not yet fully implemented.  In particular, the shipped
+version of UFS/FFS does not support storage of additional security labels,
+and so is unable to (easily) provide support for most of these features.