text: /*-
   * Copyright (c) 2000 Alfred Perlstein <alfred@FreeBSD.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	$FreeBSD: src/sys/netinet/accf_data.c,v 1.9 2002/06/18 07:42:02 tanimura Exp $
   */
  
  #define ACCEPT_FILTER_MOD
  
  #include <sys/param.h>
  #include <sys/kernel.h>
  #include <sys/sysctl.h>
  #include <sys/signalvar.h>
  #include <sys/socketvar.h>
  
  /* accept filter that holds a socket until data arrives */
  
  static void	sohasdata(struct socket *so, void *arg, int waitflag);
  
  static struct accept_filter accf_data_filter = {
  	"dataready",
  	sohasdata,
  	NULL,
  	NULL
  };
  
  static moduledata_t accf_data_mod = {
  	"accf_data",
  	accept_filt_generic_mod_event,
  	&accf_data_filter
  };
  
  DECLARE_MODULE(accf_data, accf_data_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
  
  static void
  sohasdata(struct socket *so, void *arg, int waitflag)
  {
  
  	if (!soreadable(so))
  		return;
  
  	so->so_upcall = NULL;
  	so->so_rcv.sb_flags &= ~SB_UPCALL;
  	soisconnected(so);
  	return;
  }
  