| 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 | |