NAME¶
ng_hole —
netgraph discard node
type
SYNOPSIS¶
#include <sys/types.h>
#include <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
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
- 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
- This command takes an ASCII string argument, the hook name,
and clears the statistics associated with the hook.
NGM_HOLE_GETCLR_STATS
- 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.
SEE ALSO¶
netgraph(4),
ng_echo(4),
ngctl(8)
HISTORY¶
The
ng_hole node type was implemented in
FreeBSD 4.0.
AUTHORS¶
Julian Elischer ⟨julian@FreeBSD.org⟩