VOP_OPEN(9) BSD Kernel Developer's Manual VOP_OPEN(9)NAME
VOP_OPEN, VOP_CLOSE — open or close a file
SYNOPSIS
#include <sys/param.h>
#include <sys/vnode.h>
int
VOP_OPEN(struct vnode *vp, int mode, struct ucred *cred, struct proc *p);
int
VOP_CLOSE(struct vnode *vp, int mode);
DESCRIPTION
The VOP_OPEN(9) entry point is called before a file is accessed by a
process and the VOP_CLOSE(9) entry point is called after a file is fin‐
ished with by the process.
The arguments are:
vp the vnode of the file
mode the access mode required by the calling process
p the process which is accessing the file
The access mode is a set of flags, including FREAD, FWRITE, O_NONBLOCK,
O_APPEND.
LOCKSVOP_OPEN(9) expects vp to be locked on entry and will leave it locked on
return.
VOP_CLOSE(9) expects at least a reference to be associated with the vnode
and does not care whether the vnode is locked or not. The lock and ref‐
erence state is left unchanged on return. Note that vn_close() expects
an unlocked, referenced vnode and will dereference the vnode prior to
returning.
RETURN VALUES
Zero is returned on success, otherwise an error code is returned.
PSEUDOCODE
int
vop_open(struct vnode *vp, int mode, struct ucred *cred, struct proc *p)
{
/*
* Most filesystems don't do much here.
*/
return 0;
}
SEE ALSOvnode(9), VOP_LOOKUP(9)AUTHORS
This man page was written by Doug Rabson.
BSD July 24, 1996 BSD
