accf_data.c revision 1.5 
1/*	$NetBSD: accf_data.c,v 1.5 2008/11/20 10:22:11 ad Exp $	*/
2
3/*-
4 * Copyright (c) 2000 Alfred Perlstein <alfred@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: accf_data.c,v 1.5 2008/11/20 10:22:11 ad Exp $");
31
32#define ACCEPT_FILTER_MOD
33
34#include <sys/param.h>
35#include <sys/kernel.h>
36#include <sys/module.h>
37#include <sys/sysctl.h>
38#include <sys/signalvar.h>
39#include <sys/socketvar.h>
40
41#include <netinet/accept_filter.h>
42
43MODULE(MODULE_CLASS_MISC, accf_dataready, NULL);
44
45/* accept filter that holds a socket until data arrives */
46
47static void	sohasdata(struct socket *so, void *arg, int waitflag);
48
49static struct accept_filter accf_data_filter = {
50	.accf_name = "dataready",
51	.accf_callback = sohasdata,
52};
53
54/* XXX pseudo-device */
55void	accf_dataattach(int);
56
57void
58accf_dataattach(int junk)
59{
60
61}
62
63static int
64accf_dataready_modcmd(modcmd_t cmd, void *arg)
65{
66
67	switch (cmd) {
68	case MODULE_CMD_INIT:
69		return accept_filt_add(&accf_data_filter);
70
71	case MODULE_CMD_FINI:
72		return accept_filt_del(&accf_data_filter);
73
74	default:
75		return ENOTTY;
76	}
77}
78
79static void
80sohasdata(struct socket *so, void *arg, int waitflag)
81{
82
83	if (!soreadable(so))
84		return;
85
86	so->so_upcall = NULL;
87	so->so_rcv.sb_flags &= ~SB_UPCALL;
88	soisconnected(so);
89	return;
90}
91