FreeBSD/Linux Kernel Cross Reference
sys/netinet/accf_data.c

     /*-
      * 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: releng/5.2/sys/netinet/accf_data.c 98385 2002-06-18 07:42:02Z tanimura $
     */
    
    #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;
    }

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