NetBSD/share/man/man9/vslock.9

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.\" $NetBSD: vslock.9,v 1.8 1999/03/16 00:40:48 garbled Exp $
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.\" Copyright (c) 1996, 1998 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Paul Kranenburg.
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.Dd June 15, 1996
.Dt VSLOCK 9
.Os
.Sh NAME
1997-11-11 13:07:34 +03:00
.Nm vslock ,
.Nm vsunlock
.Nd lock/unlock user space addresses in memory
.Sh SYNOPSIS
.Ft void
.Fn vslock "struct proc *p" "caddr_t addr" "size_t len"
.Ft void
.Fn vsunlock "struct proc *p" "caddr_t 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
.Fa p .
.Pp
.Sh SEE ALSO
.Xr physio 9