accf_data.c revision 97658 
1/*-
2 * Copyright (c) 2000 Alfred Perlstein <alfred@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *	$FreeBSD: head/sys/netinet/accf_data.c 97658 2002-05-31 11:52:35Z tanimura $
27 */
28
29#define ACCEPT_FILTER_MOD
30
31#include <sys/param.h>
32#include <sys/kernel.h>
33#include <sys/sysctl.h>
34#include <sys/signalvar.h>
35#include <sys/socketvar.h>
36
37/* accept filter that holds a socket until data arrives */
38
39static void	sohasdata(struct socket *so, void *arg, int waitflag);
40
41static struct accept_filter accf_data_filter = {
42	"dataready",
43	sohasdata,
44	NULL,
45	NULL
46};
47
48static moduledata_t accf_data_mod = {
49	"accf_data",
50	accept_filt_generic_mod_event,
51	&accf_data_filter
52};
53
54DECLARE_MODULE(accf_data, accf_data_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
55
56static void
57sohasdata(struct socket *so, void *arg, int waitflag)
58{
59
60	if (!soreadable(so))
61		return;
62
63	so->so_upcall = NULL;
64	so->so_rcv.sb_flags &= ~SB_UPCALL;
65	soisconnected_locked(so);
66	return;
67}
68