aa12cea2cc
Although groff_mdoc(7) gives another impression, this is the ordering most widely used and also required by mdocml/mandoc. Reviewed by: ru Approved by: philip, ed (mentors)
69 lines
2.2 KiB
Groff
69 lines
2.2 KiB
Groff
.\" -*- nroff -*-
|
|
.\"
|
|
.\" Copyright (c) 1996 Doug Rabson
|
|
.\"
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This program is free software.
|
|
.\"
|
|
.\" 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 DEVELOPERS ``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 DEVELOPERS 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 July 24, 1996
|
|
.Dt VREF 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm vref
|
|
.Nd increment the use count for a vnode
|
|
.Sh SYNOPSIS
|
|
.In sys/param.h
|
|
.In sys/vnode.h
|
|
.Ft void
|
|
.Fn vref "struct vnode *vp"
|
|
.Sh DESCRIPTION
|
|
Increment the
|
|
.Va v_usecount
|
|
field of a vnode.
|
|
.Bl -tag -width 2n
|
|
.It Fa vp
|
|
the vnode to increment
|
|
.El
|
|
.Pp
|
|
Each vnode maintains a reference count of how many parts of the system
|
|
are using the vnode.
|
|
This allows the system to detect when a vnode is
|
|
no longer being used and can be safely recycled for a different file.
|
|
.Pp
|
|
Any code in the system which is using a vnode (e.g.\& during the
|
|
operation of some algorithm or to store in a data structure) should
|
|
call
|
|
.Fn vref .
|
|
.Sh SEE ALSO
|
|
.Xr vget 9 ,
|
|
.Xr vnode 9 ,
|
|
.Xr vput 9 ,
|
|
.Xr vrefcnt 9 ,
|
|
.Xr vrele 9
|
|
.Sh AUTHORS
|
|
This manual page was written by
|
|
.An Doug Rabson .
|