1997-03-22 22:21:37 +00:00
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.\" $NetBSD: vslock.9,v 1.1 1996/06/15 20:47:29 pk Exp $
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.\"
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.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Paul Kranenburg.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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1999-07-12 21:02:10 +00:00
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.\"
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2000-12-11 15:47:53 +00:00
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.Dd June 15, 1996
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1997-03-22 22:21:37 +00:00
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.Dt VSLOCK 9
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.Os FreeBSD
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.Sh NAME
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.Nm vslock ,
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.Nm vsunlock
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.Nd lock/unlock user space addresses in memory
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.Sh SYNOPSIS
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1997-04-13 14:49:13 +00:00
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.Fd #include <sys/types.h>
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.Fd #include <vm/vm.h>
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.Fd #include <vm/vm_extern.h>
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1997-03-22 22:21:37 +00:00
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.Ft void
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.Fn vslock "caddr_t addr" "u_int len"
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.Ft void
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2000-03-23 14:33:14 +00:00
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.Fn vsunlock "caddr_t addr" "u_int len"
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1997-03-22 22:21:37 +00:00
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.Sh DESCRIPTION
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The
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.Fn vslock
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and
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.Fn vsunlock
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functions respectively lock and unlock a range of
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addresses belonging to the currently running process into memory.
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The actual amount of memory locked is a multiple of the machine's page size.
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The starting page number is computed by truncating
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.Fa addr
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to the nearest preceding page boundary, and by rounding up
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.Fa addr +
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.Fa len
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to the next page boundary.
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The process context to use for this operation is taken from the
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global variable
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.Va curproc .
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.Pp
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.\" .Sh SEE ALSO
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.\" .Xr physio 9
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.Sh BUGS
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The process pointer should be passed in as an argument.
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