1 | /* $NetBSD: accf_data.c,v 1.8 2016/07/07 06:55:43 msaitoh 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 1.8 2016/07/07 06:55:43 msaitoh 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 | |
43 | #include "ioconf.h" |
44 | |
45 | MODULE(MODULE_CLASS_MISC, accf_dataready, NULL); |
46 | |
47 | /* accept filter that holds a socket until data arrives */ |
48 | |
49 | static void sohasdata(struct socket *so, void *arg, int events, int waitflag); |
50 | |
51 | static struct accept_filter accf_data_filter = { |
52 | .accf_name = "dataready" , |
53 | .accf_callback = sohasdata, |
54 | }; |
55 | |
56 | void |
57 | accf_dataattach(int junk) |
58 | { |
59 | |
60 | } |
61 | |
62 | static int |
63 | accf_dataready_modcmd(modcmd_t cmd, void *arg) |
64 | { |
65 | |
66 | switch (cmd) { |
67 | case MODULE_CMD_INIT: |
68 | return accept_filt_add(&accf_data_filter); |
69 | |
70 | case MODULE_CMD_FINI: |
71 | return accept_filt_del(&accf_data_filter); |
72 | |
73 | default: |
74 | return ENOTTY; |
75 | } |
76 | } |
77 | |
78 | static void |
79 | sohasdata(struct socket *so, void *arg, int events, int waitflag) |
80 | { |
81 | |
82 | if (!soreadable(so)) |
83 | return; |
84 | |
85 | so->so_upcall = NULL; |
86 | so->so_rcv.sb_flags &= ~SB_UPCALL; |
87 | soisconnected(so); |
88 | return; |
89 | } |
90 | |