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(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.
SEE ALSO
HISTORY
The ng_hole node type was implemented in
FreeBSD 4.0.
AUTHORS
Julian Elischer <julian@FreeBSD.org>