NAME¶
ng_hole —
netgraph discard node type
DESCRIPTION¶
The hole node type silently discards all data and
control messages it receives. This type is used for testing and debugging.
HOOKS¶
A ng_hole 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 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 ng_hole node type was implemented in
FreeBSD 4.0.
