1 /* $NetBSD: accf_data.c,v 1.6 2009/09/02 14:56:57 tls 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 1.6 2009/09/02 14:56:57 tls 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 MODULE(MODULE_CLASS_MISC, accf_dataready, NULL); 44 45 /* accept filter that holds a socket until data arrives */ 46 47 static void sohasdata(struct socket *so, void *arg, int events, int waitflag); 48 49 static struct accept_filter accf_data_filter = { 50 .accf_name = "dataready", 51 .accf_callback = sohasdata, 52 }; 53 54 /* XXX pseudo-device */ 55 void accf_dataattach(int); 56 57 void 58 accf_dataattach(int junk) 59 { 60 61 } 62 63 static int 64 accf_dataready_modcmd(modcmd_t cmd, void *arg) 65 { 66 67 switch (cmd) { 68 case MODULE_CMD_INIT: 69 return accept_filt_add(&accf_data_filter); 70 71 case MODULE_CMD_FINI: 72 return accept_filt_del(&accf_data_filter); 73 74 default: 75 return ENOTTY; 76 } 77 } 78 79 static void 80 sohasdata(struct socket *so, void *arg, int events, int waitflag) 81 { 82 83 if (!soreadable(so)) 84 return; 85 86 so->so_upcall = NULL; 87 so->so_rcv.sb_flags &= ~SB_UPCALL; 88 soisconnected(so); 89 return; 90 } 91