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+.\"-
+.\" Copyright (c) 2021 Gleb Popov
+.\" 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.
+.\"
+.Dd January 20, 2021
+.Dt ACL_CMP_NP 3
+.Os
+.Sh NAME
+.Nm acl_cmp
+.Nd compare between two ACLs
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/acl.h
+.Ft int
+.Fn acl_cmp_np "acl_t acl1" "acl_t acl2"
+.Sh DESCRIPTION
+The
+.Fn acl_cmp_np
+function is a non-portable call that checks if ACLs pointed to by
+.Va acl1
+and
+.Va acl2
+are equivalent.
+The two ACLs are considered equal when they contain the same
+entries with matching tag types, qualifiers and permissions.
+.Sh RETURN VALUES
+Upon successful completion, this function returns 0 if the given ACLs are
+equivalent and 1 if they differ.
+Otherwise, the value -1 is returned, and
+.Va errno
+indicates the error.
+.Sh ERRORS
+If any of the following conditions occur, the
+.Fn acl_cmp_np
+function shall return a value of
+.Va -1
+and set
+.Va errno
+to the corresponding value:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+Either first or second argument does not point to a valid ACL.
+.El
+.Sh SEE ALSO
+.Xr acl 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
+.Fx
+POSIX.1e implementation
+page for more information.
+.Sh HISTORY
+POSIX.1e support was introduced in
+.Fx 4.0 ,
+and development continues.
+.Sh AUTHORS
+.An Gleb Popov