1.\" 2.\" Copyright (c) 2000 Alfred Perlstein 3.\" 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.\" $FreeBSD: src/share/man/man9/accf_data.9,v 1.8 2005/01/18 20:52:51 ru Exp $ 27.\" " 28.Dd August 10, 2008 29.Os 30.Dt ACCF_DATA 9 31.Sh NAME 32.Nm accf_data 33.Nd buffer incoming connections until data arrives 34.Sh SYNOPSIS 35.Cd "options INET" 36.Cd "pseudo-device accf_data" 37.Sh DESCRIPTION 38This is a filter to be placed on a socket that will be using 39.Fn accept 40to receive incoming connections. 41.Pp 42It prevents the application from receiving the connected descriptor via 43.Fn accept 44until data arrives on the connection. 45.Sh EXAMPLES 46If the accf_data accept filter is present in the kernel configuration, 47this will enable the data accept filter 48on the socket 49.Fa sok . 50.Bd -literal -offset 0i 51 struct accept_filter_arg afa; 52 53 bzero(&afa, sizeof(afa)); 54 strcpy(afa.af_name, "dataready"); 55 setsockopt(sok, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa)); 56.Ed 57.Sh SEE ALSO 58.Xr setsockopt 2 , 59.Xr accept_filter 9 , 60.Xr accf_http 9 61.Sh HISTORY 62The accept filter mechanism and the 63accf_data filter were introduced in 64.Fx 4.0 . 65They were ported to 66.Nx 67by Coyote Point Systems and appeared in 68.Nx 5.0 . 69.Sh AUTHORS 70This manual page and the filter were written by 71.An Alfred Perlstein . 72