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.