92 lines
2.7 KiB
Groff
92 lines
2.7 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.
|
|
.\"
|
|
.\" $Id: VOP_OPENCLOSE.9,v 1.1 1997/03/03 18:00:28 dfr Exp $
|
|
.\"
|
|
.Dd July 24, 1996
|
|
.Os
|
|
.Dt VOP_OPEN 9
|
|
.Sh NAME
|
|
.Nm VOP_OPEN ,
|
|
.Nm VOP_CLOSE
|
|
.Nd open or close a file
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/vnode.h>
|
|
.Ft int
|
|
.Fn VOP_OPEN "struct vnode *vp" "int mode" "struct ucred *cred" "struct proc *p"
|
|
.Ft int
|
|
.Fn VOP_CLOSE "struct vnode *vp" "int mode" "struct ucred *cred" "struct proc *p"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Xr VOP_OPEN 9
|
|
entry point is called before a file is accessed by a process and the
|
|
.Xr VOP_CLOSE 9
|
|
entry point is called after a file is finished with by the process.
|
|
.Pp
|
|
The arguments are:
|
|
.Bl -tag -width mode
|
|
.It Ar vp
|
|
the vnode of the file
|
|
.It Ar mode
|
|
the access mode required by the calling process
|
|
.It Ar p
|
|
the process which is accessing the file
|
|
.El
|
|
.Pp
|
|
The access mode is a set of flags, including
|
|
.Dv FREAD ,
|
|
.Dv FWRITE ,
|
|
.Dv O_NONBLOCK ,
|
|
.Dv O_APPEND .
|
|
.Sh LOCKS
|
|
The vnode
|
|
.Fa vp
|
|
should be locked on entry and will still be locked on exit for
|
|
.Xr VOP_OPEN 9
|
|
and unlocked on entry and exit for
|
|
.Xr VOP_CLOSE 9 .
|
|
.Sh RETURN VALUES
|
|
Zero is returned on success, otherwise an error code is returned.
|
|
.Sh PSEUDOCODE
|
|
.Bd -literal
|
|
int
|
|
vop_open(struct vnode *vp, int mode, struct ucred *cred, struct proc *p)
|
|
{
|
|
/*
|
|
* Most filesystems don't do much here.
|
|
*/
|
|
return 0;
|
|
}
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr vnode 9 ,
|
|
.Xr VOP_LOOKUP 9
|
|
.Sh AUTHORS
|
|
This man page was written by Doug Rabson.
|
|
|