Add kernacc(9) that documents the kernacc() and useracc() kernel

functions.

Obtained from: NetBSD (renamed from access.9)

1 files changed, 81 insertions, 0 deletions

diff --git a/share/man/man9/kernacc.9 b/share/man/man9/kernacc.9
new file mode 100644
index 0000000..9ac96d4
--- /dev/null
+++ b/share/man/man9/kernacc.9
@@ -0,0 +1,81 @@
+.\"	$NetBSD: access.9,v 1.1 1996/06/16 10:38:35 pk Exp $
+.\"
+.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Paul Kranenburg.
+.\"
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"        This product includes software developed by the NetBSD
+.\"        Foundation, Inc. and its contributors.
+.\" 4. Neither the name of The NetBSD Foundation nor the names of its
+.\"    contributors may be used to endorse or promote products derived
+.\"    from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 REGENTS 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 June 16, 1996
+.Dt ACCESS 9
+.Os FreeBSD
+.Sh NAME
+.Nm kernacc ,
+.Nm useracc
+.Nd check memory regions for accessibility
+.Sh SYNOPSIS
+.Ft int
+.Fn kernacc "caddr_t addr" "int len" "int rw"
+.Ft int
+.Fn useracc "caddr_t addr" "int len" "int rw"
+.Sh DESCRIPTION
+The
+.Fn kernacc
+and
+.Fn useracc
+functions check whether operations of the type specified in
+.Fa rw
+are permitted in the range of virtual addresses given by
+.Fa addr
+and
+.Fa len .
+The possible values of
+.Fa rw
+are
+.Dv B_READ
+and
+.Dv B_WRITE .
+.Fn kernacc
+checks addresses in the kernel address space, while
+.Fn useracc
+considers
+.Fa addr
+to represent an user space address. The process context to use for this
+operation is taken from the global variable
+.Va curproc .
+.Pp
+.Sh RETURN VALUES
+Both functions return 1 if the type of access specified by
+.Fa rw
+is permitted. Otherwise 0 is returned.
+.Pp
+.Sh BUGS
+The process pointer should be passed in as an argument.