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+.\"-
+.\" Copyright (c) 2001 Chris D. Faulhaber
+.\" 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 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 March 10, 2001
+.Dt ACL_CALC_MASK 3
+.Os
+.Sh NAME
+.Nm acl_calc_mask
+.Nd calculate and set ACL mask permissions
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/acl.h
+.Ft int
+.Fn acl_calc_mask "acl_t *acl_p"
+.Sh DESCRIPTION
+The
+.Fn acl_calc_mask
+function
+is a POSIX.1e call that calculates and set the permissions
+associated with the
+.Dv ACL_MASK
+ACL entry of the ACL referred to by
+.Fa acl_p .
+.Pp
+The value of new permissions are the union of the permissions
+granted by the
+.Dv ACL_GROUP , ACL_GROUP_OBJ , ACL_USER
+tag types which
+match processes in the file group class contained in the ACL
+referred to by
+.Fa acl_p .
+.Pp
+If the ACL referred to by
+.Fa acl_p
+already contains an
+.Dv ACL_MASK
+entry, its permissions shall be
+overwritten; if it does not contain an
+.Dv ACL_MASK
+entry, one shall
+be added.
+.Sh RETURN VALUES
+.Rv -std acl_calc_mask
+.Sh ERRORS
+The
+.Fn acl_calc_mask
+function fails if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+Argument
+.Fa acl_p
+does not point to a pointer to a valid ACL.
+.El
+.Sh SEE ALSO
+.Xr acl 3 ,
+.Xr acl_get_entry 3 ,
+.Xr acl_valid 3 ,
+.Xr posix1e 3
+.Sh STANDARDS
+POSIX.1e is described in IEEE POSIX.1e draft 17.
+.Sh HISTORY
+POSIX.1e support was introduced in
+.Fx 4.0 .
+The
+.Fn acl_calc_mask
+function was added in
+.Fx 5.0 .
+.Sh AUTHORS
+The
+.Fn acl_calc_mask
+function was written by
+.An Chris D. Faulhaber Aq jedgar@fxp.org .