| NG_DEVICE(4) | Device Drivers Manual | NG_DEVICE(4) |
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_DEVNAMEThis 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.
The device node type was first implemented
in FreeBSD 5.0.
Mark Santcroos
<marks@ripe.net>
Gleb Smirnoff
<glebius@FreeBSD.org>
| October 19, 2004 | Debian |