table of contents
NG_DEVICE(4) | Device Drivers Manual | NG_DEVICE(4) |
NAME¶
ng_device
—
device netgraph node type
SYNOPSIS¶
#include
<netgraph/ng_device.h>
DESCRIPTION¶
Adevice
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¶
Adevice
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¶
Thedevice
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 aNGM_SHUTDOWN
control message, or upon hook
disconnection. The associated device entry is removed and becomes available
for use by future device
nodes.
SEE ALSO¶
netgraph(4), ngctl(8)HISTORY¶
Thedevice
node type was first implemented in
FreeBSD 5.0.
AUTHORS¶
Mark Santcroos ⟨marks@ripe.net⟩Gleb Smirnoff ⟨glebius@FreeBSD.org⟩
October 19, 2004 | Debian |