ng_hole(4)
netgraph discard node type
SYNOPSIS
In sys/types.h
In netgraph/ng_hole.h
DESCRIPTION
The
hole
node type silently discards all data and control messages it receives.
This type is used for testing and debugging.
HOOKS
A
node accepts any request to connect, regardless of the hook name,
as long as the name is unique.
CONTROL MESSAGES
This node type supports the generic control messages, plus the
following:
- NGM_HOLE_GET_STATS (getstats
)
-
This command takes an
ASCII
string argument, the hook name, and returns the statistics
associated with the hook as a
Vt struct ng_hole_hookstat .
- NGM_HOLE_CLR_STATS (clrstats
)
-
This command takes an
ASCII
string argument, the hook name, and clears the statistics
associated with the hook.
- NGM_HOLE_GETCLR_STATS (getclrstats
)
-
This command is identical to
NGM_HOLE_GET_STATS
except that the statistics are also atomically cleared.
SHUTDOWN
This node shuts down upon receipt of a
NGM_SHUTDOWN
control message, or when all hooks have been disconnected.
HISTORY
The
node type was implemented in
Fx 4.0 .
