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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: src/sys/netinet/accf_data.c,v 1.11 2007/10/07 20:44:22 silby Exp $");
29
30 #define ACCEPT_FILTER_MOD
31
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/sysctl.h>
36 #include <sys/signalvar.h>
37 #include <sys/socketvar.h>
38
39 /* accept filter that holds a socket until data arrives */
40
41 static void sohasdata(struct socket *so, void *arg, int waitflag);
42
43 static struct accept_filter accf_data_filter = {
44 "dataready",
45 sohasdata,
46 NULL,
47 NULL
48 };
49
50 static moduledata_t accf_data_mod = {
51 "accf_data",
52 accept_filt_generic_mod_event,
53 &accf_data_filter
54 };
55
56 DECLARE_MODULE(accf_data, accf_data_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
57
58 static void
59 sohasdata(struct socket *so, void *arg, int waitflag)
60 {
61
62 if (!soreadable(so))
63 return;
64
65 so->so_upcall = NULL;
66 so->so_rcv.sb_flags &= ~SB_UPCALL;
67 soisconnected(so);
68 return;
69 }
70
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