ng_device
—
device netgraph node type
#include
<netgraph/ng_device.h>
A
device
node is both a netgraph node and a
system device interface. When a
device
node
is created, a new device entry appears which is accessible via the regular
file operators such as
open(2),
close(2),
read(2),
write(2),
etc.
The first node is created as
/dev/ngd0, all
subsequent nodes
/dev/ngd1,
/dev/ngd2, etc.
A
device
node has a single hook with an
arbitrary name. All data coming in over the hook will be presented to the
device for
read(2).
All data coming in from the device entry by
write(2)
will be forwarded to the hook.
The
device
node supports one non-generic
control message:
NGM_DEVICE_GET_DEVNAME
- Returns device name corresponding to a node.
This node shuts down upon receipt of a
NGM_SHUTDOWN
control message, or upon hook
disconnection. The associated device entry is removed and becomes available
for use by future
device
nodes.
netgraph(4),
ngctl(8)
The
device
node type was first implemented in
FreeBSD 5.0.
Mark Santcroos
<
marks@ripe.net>
Gleb Smirnoff
<
glebius@FreeBSD.org>