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 45MODULE(MODULE_CLASS_MISC, accf_dataready, NULL); 46 47/* accept filter that holds a socket until data arrives */ 48 49static void sohasdata(struct socket *so, void *arg, int events, int waitflag); 50 51static struct accept_filter accf_data_filter = { 52 .accf_name = "dataready", 53 .accf_callback = sohasdata, 54}; 55 56void 57accf_dataattach(int junk) 58{ 59 60} 61 62static int 63accf_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 78static void 79sohasdata(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