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

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    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: src/sys/netinet/accf_data.c,v 1.10 2004/05/30 20:23:30 phk Exp $
   27  */
   28 
   29 #define ACCEPT_FILTER_MOD
   30 
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/module.h>
   34 #include <sys/sysctl.h>
   35 #include <sys/signalvar.h>
   36 #include <sys/socketvar.h>
   37 
   38 /* accept filter that holds a socket until data arrives */
   39 
   40 static void     sohasdata(struct socket *so, void *arg, int waitflag);
   41 
   42 static struct accept_filter accf_data_filter = {
   43         "dataready",
   44         sohasdata,
   45         NULL,
   46         NULL
   47 };
   48 
   49 static moduledata_t accf_data_mod = {
   50         "accf_data",
   51         accept_filt_generic_mod_event,
   52         &accf_data_filter
   53 };
   54 
   55 DECLARE_MODULE(accf_data, accf_data_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
   56 
   57 static void
   58 sohasdata(struct socket *so, void *arg, int waitflag)
   59 {
   60 
   61         if (!soreadable(so))
   62                 return;
   63 
   64         so->so_upcall = NULL;
   65         so->so_rcv.sb_flags &= ~SB_UPCALL;
   66         soisconnected(so);
   67         return;
   68 }

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