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      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 (at) 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