/*      $NetBSD: accf_data.c,v 1.8 2016/07/07 06:55:43 msaitoh Exp $    */

/*-
* Copyright (c) 2000 Alfred Perlstein <[email protected]>
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: accf_data.c,v 1.8 2016/07/07 06:55:43 msaitoh Exp $");

#define ACCEPT_FILTER_MOD

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/signalvar.h>
#include <sys/socketvar.h>

#include <netinet/accept_filter.h>

#include "ioconf.h"

MODULE(MODULE_CLASS_MISC, accf_dataready, NULL);

/* accept filter that holds a socket until data arrives */

static void sohasdata(struct socket *so, void *arg, int events, int waitflag);

static struct accept_filter accf_data_filter = {
       .accf_name = "dataready",
       .accf_callback = sohasdata,
};

void
accf_dataattach(int junk)
{

}

static int
accf_dataready_modcmd(modcmd_t cmd, void *arg)
{

       switch (cmd) {
       case MODULE_CMD_INIT:
               return accept_filt_add(&accf_data_filter);

       case MODULE_CMD_FINI:
               return accept_filt_del(&accf_data_filter);

       default:
               return ENOTTY;
       }
}

static void
sohasdata(struct socket *so, void *arg, int events, int waitflag)
{

       if (!soreadable(so))
               return;

       so->so_upcall = NULL;
       so->so_rcv.sb_flags &= ~SB_UPCALL;
       soisconnected(so);
       return;
}