1.\" $NetBSD: access.9,v 1.1 1996/06/16 10:38:35 pk Exp $
2.\"
3.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
4.\" All rights reserved.
5.\"
6.\" This code is derived from software contributed to The NetBSD Foundation
7.\" by Paul Kranenburg.
8.\"
9.\" Redistribution and use in source and binary forms, with or without
10.\" modification, are permitted provided that the following conditions
11.\" are met:
12.\" 1. Redistributions of source code must retain the above copyright
13.\" notice, this list of conditions and the following disclaimer.
14.\" 2. Redistributions in binary form must reproduce the above copyright
15.\" notice, this list of conditions and the following disclaimer in the
16.\" documentation and/or other materials provided with the distribution.
17.\" 3. All advertising materials mentioning features or use of this software
18.\" must display the following acknowledgement:
19.\" This product includes software developed by the NetBSD
20.\" Foundation, Inc. and its contributors.
21.\" 4. Neither the name of The NetBSD Foundation nor the names of its
22.\" contributors may be used to endorse or promote products derived
23.\" from this software without specific prior written permission.
24.\"
25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
29.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35.\" POSSIBILITY OF SUCH DAMAGE.
36.\"
| 1.\" $NetBSD: access.9,v 1.1 1996/06/16 10:38:35 pk Exp $
2.\"
3.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
4.\" All rights reserved.
5.\"
6.\" This code is derived from software contributed to The NetBSD Foundation
7.\" by Paul Kranenburg.
8.\"
9.\" Redistribution and use in source and binary forms, with or without
10.\" modification, are permitted provided that the following conditions
11.\" are met:
12.\" 1. Redistributions of source code must retain the above copyright
13.\" notice, this list of conditions and the following disclaimer.
14.\" 2. Redistributions in binary form must reproduce the above copyright
15.\" notice, this list of conditions and the following disclaimer in the
16.\" documentation and/or other materials provided with the distribution.
17.\" 3. All advertising materials mentioning features or use of this software
18.\" must display the following acknowledgement:
19.\" This product includes software developed by the NetBSD
20.\" Foundation, Inc. and its contributors.
21.\" 4. Neither the name of The NetBSD Foundation nor the names of its
22.\" contributors may be used to endorse or promote products derived
23.\" from this software without specific prior written permission.
24.\"
25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
29.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35.\" POSSIBILITY OF SUCH DAMAGE.
36.\"
|
37.Dd June 16, 1996
38.Dt KERNACC 9
39.Os FreeBSD
40.Sh NAME
41.Nm kernacc ,
42.Nm useracc
43.Nd check memory regions for accessibility
44.Sh SYNOPSIS
45.Fd #include <sys/types.h>
46.Fd #include <vm/vm.h>
47.Fd #include <vm/vm_extern.h>
48.Ft int
49.Fn kernacc "caddr_t addr" "int len" "int rw"
50.Ft int
51.Fn useracc "caddr_t addr" "int len" "int rw"
52.Sh DESCRIPTION
53The
54.Fn kernacc
55and
56.Fn useracc
57functions check whether operations of the type specified in
58.Fa rw
59are permitted in the range of virtual addresses given by
60.Fa addr
61and
62.Fa len .
63The possible values of
64.Fa rw
65are
66.Dv B_READ
67and
68.Dv B_WRITE .
69.Fn kernacc
70checks addresses in the kernel address space, while
71.Fn useracc
72considers
73.Fa addr
74to represent an user space address. The process context to use for this
75operation is taken from the global variable
76.Va curproc .
77.Pp
78.Sh RETURN VALUES
79Both functions return 1 if the type of access specified by
80.Fa rw
81is permitted. Otherwise 0 is returned.
82.Pp
83.Sh BUGS
84The process pointer should be passed in as an argument.
| 39.Dd June 16, 1996
40.Dt KERNACC 9
41.Os FreeBSD
42.Sh NAME
43.Nm kernacc ,
44.Nm useracc
45.Nd check memory regions for accessibility
46.Sh SYNOPSIS
47.Fd #include <sys/types.h>
48.Fd #include <vm/vm.h>
49.Fd #include <vm/vm_extern.h>
50.Ft int
51.Fn kernacc "caddr_t addr" "int len" "int rw"
52.Ft int
53.Fn useracc "caddr_t addr" "int len" "int rw"
54.Sh DESCRIPTION
55The
56.Fn kernacc
57and
58.Fn useracc
59functions check whether operations of the type specified in
60.Fa rw
61are permitted in the range of virtual addresses given by
62.Fa addr
63and
64.Fa len .
65The possible values of
66.Fa rw
67are
68.Dv B_READ
69and
70.Dv B_WRITE .
71.Fn kernacc
72checks addresses in the kernel address space, while
73.Fn useracc
74considers
75.Fa addr
76to represent an user space address. The process context to use for this
77operation is taken from the global variable
78.Va curproc .
79.Pp
80.Sh RETURN VALUES
81Both functions return 1 if the type of access specified by
82.Fa rw
83is permitted. Otherwise 0 is returned.
84.Pp
85.Sh BUGS
86The process pointer should be passed in as an argument.
|