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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>