90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/* $NetBSD: accf_data.c,v 1.8 2016/07/07 06:55:43 msaitoh 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 1.8 2016/07/07 06:55:43 msaitoh 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/module.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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#include "ioconf.h"
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MODULE(MODULE_CLASS_MISC, accf_dataready, NULL);
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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 events, 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
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accf_dataattach(int junk)
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{
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}
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static int
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accf_dataready_modcmd(modcmd_t cmd, void *arg)
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{
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switch (cmd) {
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case MODULE_CMD_INIT:
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return accept_filt_add(&accf_data_filter);
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case MODULE_CMD_FINI:
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return accept_filt_del(&accf_data_filter);
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default:
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return ENOTTY;
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}
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}
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static void
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sohasdata(struct socket *so, void *arg, int events, 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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