99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/* $NetBSD: accf_data.c,v 1.2 2008/10/14 13:05:44 ad Exp $ */
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/*-
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* Copyright (c) 2000 Alfred Perlstein <alfred@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: accf_data.c,v 1.2 2008/10/14 13:05:44 ad Exp $");
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#define ACCEPT_FILTER_MOD
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lkm.h>
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#include <sys/sysctl.h>
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#include <sys/signalvar.h>
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#include <sys/socketvar.h>
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#include <netinet/accept_filter.h>
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/* accept filter that holds a socket until data arrives */
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static void sohasdata(struct socket *so, void *arg, int waitflag);
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static struct accept_filter accf_data_filter = {
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.accf_name = "dataready",
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.accf_callback = sohasdata,
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};
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void accf_dataattach(int);
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void accf_dataattach(int num)
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{
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accept_filt_generic_mod_event(NULL, LKM_E_LOAD, &accf_data_filter);
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}
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/*
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* This code is to make DATA ready accept filer as LKM.
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* To compile as LKM we need to move this set of code into
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* another file and include this file for compilation when
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* making LKM
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*/
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#ifdef _LKM
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static int accf_data_handle(struct lkm_table * lkmtp, int cmd);
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int accf_data_lkmentry(struct lkm_table * lkmtp, int cmd, int ver);
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MOD_MISC("accf_data");
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static int accf_data_handle(struct lkm_table * lkmtp, int cmd)
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{
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return accept_filt_generic_mod_event(lkmtp, cmd, &accf_data_filter);
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}
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/*
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* the module entry point.
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*/
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int
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accf_data_lkmentry(struct lkm_table *lkmtp, int cmd, int ver)
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{
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DISPATCH(lkmtp, cmd, ver, accf_data_handle, accf_data_handle,
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accf_data_handle)
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}
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#endif
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static void
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sohasdata(struct socket *so, void *arg, int waitflag)
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{
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if (!soreadable(so))
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return;
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so->so_upcall = NULL;
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so->so_rcv.sb_flags &= ~SB_UPCALL;
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soisconnected(so);
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return;
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}
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