Интерактивная система просмотра системных руководств (man-ов)
ng_device (4)
>> ng_device (4) ( FreeBSD man: Специальные файлы /dev/* )
BSD mandoc
NAME
ng_device
- device netgraph node type
SYNOPSIS
#include <netgraph/ng_device.h>
DESCRIPTION
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.
HOOKS
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.
CONTROL MESSAGES
The
device
node supports one non-generic control message:
NGM_DEVICE_GET_DEVNAME
Returns device name corresponding to a node.
SHUTDOWN
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.
