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 * $FreeBSD$ 27 */ 28 29 #define ACCEPT_FILTER_MOD 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/sysproto.h> 34 #include <sys/kernel.h> 35 #include <sys/proc.h> 36 #include <sys/malloc.h> 37 #include <sys/unistd.h> 38 #include <sys/file.h> 39 #include <sys/fcntl.h> 40 #include <sys/protosw.h> 41 #include <sys/socket.h> 42 #include <sys/socketvar.h> 43 #include <sys/stat.h> 44 #include <sys/mbuf.h> 45 #include <sys/resource.h> 46 #include <sys/sysent.h> 47 #include <sys/resourcevar.h> 48 49 /* accept filter that holds a socket until data arrives */ 50 51 static void sohasdata(struct socket *so, void *arg, int waitflag); 52 53 static struct accept_filter accf_data_filter = { 54 "dataready", 55 sohasdata, 56 NULL, 57 NULL 58 }; 59 60 static moduledata_t accf_data_mod = { 61 "accf_data", 62 accept_filt_generic_mod_event, 63 &accf_data_filter 64 }; 65 66 DECLARE_MODULE(accf_data, accf_data_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 67 68 static void 69 sohasdata(struct socket *so, void *arg, int waitflag) 70 { 71 72 if (!soreadable(so)) { 73 return; 74 } 75 76 so->so_upcall = NULL; 77 so->so_rcv.sb_flags &= ~SB_UPCALL; 78 soisconnected(so); 79 return; 80 } 81