1.\" Copyright (c) 1996-1999 Whistle Communications, Inc. 2.\" All rights reserved. 3.\" 4.\" Subject to the following obligations and disclaimer of warranty, use and 5.\" redistribution of this software, in source or object code forms, with or 6.\" without modifications are expressly permitted by Whistle Communications; 7.\" provided, however, that: 8.\" 1. Any and all reproductions of the source or object code must include the 9.\" copyright notice above and the following disclaimer of warranties; and 10.\" 2. No rights are granted, in any manner or form, to use Whistle 11.\" Communications, Inc. trademarks, including the mark "WHISTLE 12.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as 13.\" such appears in the above copyright notice or in the software. 14.\" 15.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 16.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 17.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 18.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 19.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 20.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 21.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 22.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 23.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 24.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 25.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 26.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 27.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 28.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 31.\" OF SUCH DAMAGE. 32.\" 33.\" Author: Archie Cobbs <archie@FreeBSD.org> 34.\" 35.\" $FreeBSD: src/share/man/man4/ng_hole.4,v 1.10.2.1 2001/12/21 09:00:51 ru Exp $ 36.\" $Whistle: ng_hole.8,v 1.4 1999/01/25 23:46:26 archie Exp $ 37.\" 38.Dd January 19, 1999 39.Dt NG_HOLE 4 40.Os 41.Sh NAME 42.Nm ng_hole 43.Nd netgraph discard node type 44.Sh SYNOPSIS 45.In netgraph/hole/ng_hole.h 46.Sh DESCRIPTION 47The 48.Nm hole 49node type silently discards all data and control messages it receives. 50This type is used for testing and debugging. 51.Sh HOOKS 52A 53.Nm 54node accepts any request to connect, regardless of the hook name, 55as long as the name is unique. 56.Sh CONTROL MESSAGES 57This node type supports only the generic control messages. 58Other control messages are silently discarded. 59.Sh SHUTDOWN 60This node shuts down upon receipt of a 61.Dv NGM_SHUTDOWN 62control message, or when all hooks have been disconnected. 63.Sh SEE ALSO 64.Xr netgraph 4 , 65.Xr ng_echo 4 , 66.Xr ngctl 8 67.Sh HISTORY 68The 69.Nm 70node type was implemented in 71.Fx 4.0 . 72.Sh AUTHORS 73.An Julian Elischer Aq Mt julian@FreeBSD.org 74