accf_data.c revision 65643
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: head/sys/netinet/accf_data.c 65643 2000-09-09 18:47:46Z alfred $ 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 52static void sohasdata(struct socket *so, void *arg, int waitflag); 53 54static struct accept_filter accf_data_filter = { 55 "dataready", 56 sohasdata, 57 NULL, 58 NULL 59}; 60 61static moduledata_t accf_data_mod = { 62 "accf_data", 63 accept_filt_generic_mod_event, 64 &accf_data_filter 65}; 66 67DECLARE_MODULE(accf_data, accf_data_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 68 69static void 70sohasdata(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} 82