NAME
getdevvp
, bdevvp
,
cdevvp
—
create a vnode for a device
SYNOPSIS
#include
<sys/param.h>
#include <sys/vnode.h>
int
getdevvp
(dev_t
dev, struct vnode
**vpp, enum vtype
type);
int
bdevvp
(dev_t
dev, struct vnode
**vpp);
int
cdevvp
(dev_t
dev, struct vnode
**vpp);
DESCRIPTION
The
getdevvp
()
function creates a vnode for a device of type type
with a device number of dev, and returns a pointer to
it in vpp.
Its arguments are:
- dev
- The device number of the desired device.
- vpp
- Where the vnode will be returned on success.
- type
- The type of device, either:
VBLK
- For a block device, or
VCHR
- for a character device.
bdevvp
()
and
cdevvp
()
use getdevvp internally, specifying the third argument.
bdevvp
() will create a vnode for a block device, and
is used for the root file system and swap areas, among other things.
cdevvp
() will create a vnode for a character device
and is used in console handling.
RETURN VALUES
All functions return 0 on success. If an error occurs, vpp will point to a NULLVP. See getnewvnode(9) for further return values.