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 * $FreeBSD$
27 */
28
29 #define ACCEPT_FILTER_MOD
30
31 #include <sys/param.h>
32 #include <sys/sysctl.h>
33 #include <sys/systm.h>
34 #include <sys/sysproto.h>
35 #include <sys/kernel.h>
36 #include <sys/proc.h>
37 #include <sys/malloc.h>
38 #include <sys/unistd.h>
39 #include <sys/file.h>
40 #include <sys/fcntl.h>
41 #include <sys/protosw.h>
42 #include <sys/socket.h>
43 #include <sys/socketvar.h>
44 #include <sys/stat.h>
45 #include <sys/mbuf.h>
46 #include <sys/resource.h>
47 #include <sys/sysent.h>
48 #include <sys/resourcevar.h>
49
50 /* accept filter that holds a socket until data arrives */
51
52 static void sohasdata(struct socket *so, void *arg, int waitflag);
53
54 static struct accept_filter accf_data_filter = {
55 "dataready",
56 sohasdata,
57 NULL,
58 NULL
59 };
60
61 static moduledata_t accf_data_mod = {
62 "accf_data",
63 accept_filt_generic_mod_event,
64 &accf_data_filter
65 };
66
67 DECLARE_MODULE(accf_data, accf_data_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
68
69 static void
70 sohasdata(struct socket *so, void *arg, int waitflag)
71 {
72
73 if (!soreadable(so)) {
74 return;
75 }
76
77 so->so_upcall = NULL;
78 so->so_rcv.sb_flags &= ~SB_UPCALL;
79 soisconnected(so);
80 return;
81 }
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