89 lines
2.9 KiB
Groff
89 lines
2.9 KiB
Groff
.\" $NetBSD: vslock.9,v 1.1 1996/06/15 20:47:29 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.
|
|
.\"
|
|
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd August 29, 2012
|
|
.Dt VSLOCK 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm vslock ,
|
|
.Nm vsunlock
|
|
.Nd lock/unlock user space addresses in memory
|
|
.Sh SYNOPSIS
|
|
.In sys/param.h
|
|
.In sys/proc.h
|
|
.In vm/vm.h
|
|
.In vm/vm_extern.h
|
|
.Ft int
|
|
.Fn vslock "void *addr" "size_t len"
|
|
.Ft void
|
|
.Fn vsunlock "void *addr" "size_t len"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn vslock
|
|
and
|
|
.Fn vsunlock
|
|
functions respectively lock and unlock a range of
|
|
addresses belonging to the currently running process into memory.
|
|
The actual amount of memory locked is a multiple of the machine's page size.
|
|
The starting page number is computed by truncating
|
|
.Fa addr
|
|
to the nearest preceding page boundary, and by rounding up
|
|
.Fa addr +
|
|
.Fa len
|
|
to the next page boundary.
|
|
The process context to use for this operation is taken from the
|
|
global variable
|
|
.Va curproc .
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Fn vslock
|
|
function will return 0 on success, otherwise it will return
|
|
one of the errors listed below.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn vslock
|
|
function will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EINVAL
|
|
The
|
|
.Fa addr
|
|
and
|
|
.Fa len
|
|
parameters specify a memory range that wraps around the end of the
|
|
machine address space.
|
|
.It Bq Er ENOMEM
|
|
The size of the specified address range exceeds the system
|
|
limit on locked memory.
|
|
.It Bq Er EFAULT
|
|
Some portion of the indicated address range is not allocated.
|
|
There was an error faulting/mapping a page.
|
|
.El
|