ng_device man page on FreeBSD

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NG_DEVICE(4)		 BSD Kernel Interfaces Manual		  NG_DEVICE(4)

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 acces‐
     sible 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.

SEE ALSO
     netgraph(4), ngctl(8)

HISTORY
     The device node type was first implemented in FreeBSD 5.0.

AUTHORS
     Mark Santcroos ⟨marks@ripe.net⟩
     Gleb Smirnoff ⟨glebius@FreeBSD.org⟩

BSD			       October 19, 2004				   BSD
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