NetBSD/sys/netinet/accf_data.c

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2008-11-20 13:22:11 +03:00
/* $NetBSD: accf_data.c,v 1.5 2008/11/20 10:22:11 ad Exp $ */
/*-
* Copyright (c) 2000 Alfred Perlstein <alfred@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: accf_data.c,v 1.5 2008/11/20 10:22:11 ad Exp $");
#define ACCEPT_FILTER_MOD
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/signalvar.h>
#include <sys/socketvar.h>
#include <netinet/accept_filter.h>
MODULE(MODULE_CLASS_MISC, accf_dataready, NULL);
/* accept filter that holds a socket until data arrives */
static void sohasdata(struct socket *so, void *arg, int waitflag);
static struct accept_filter accf_data_filter = {
.accf_name = "dataready",
.accf_callback = sohasdata,
};
/* XXX pseudo-device */
void accf_dataattach(int);
void
accf_dataattach(int junk)
{
}
static int
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accf_dataready_modcmd(modcmd_t cmd, void *arg)
{
switch (cmd) {
case MODULE_CMD_INIT:
return accept_filt_add(&accf_data_filter);
case MODULE_CMD_FINI:
return accept_filt_del(&accf_data_filter);
default:
return ENOTTY;
}
}
static void
sohasdata(struct socket *so, void *arg, int waitflag)
{
if (!soreadable(so))
return;
so->so_upcall = NULL;
so->so_rcv.sb_flags &= ~SB_UPCALL;
soisconnected(so);
return;
}