The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/bpf_compat.h

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    1 /*-
    2  * Copyright (c) 1992, 1993
    3  *      The Regents of the University of California.  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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)bpf_compat.h        8.1 (Berkeley) 6/10/93
   30  * $FreeBSD: releng/6.1/sys/net/bpf_compat.h 128019 2004-04-07 20:46:16Z imp $
   31  */
   32 
   33 #ifndef _NET_BPF_COMPAT_H_
   34 #define _NET_BPF_COMPAT_H_
   35 
   36 /*
   37  * Some hacks for compatibility across SunOS and 4.4BSD.  We emulate malloc
   38  * and free with mbuf clusters.  We store a pointer to the mbuf in the first
   39  * word of the mbuf and return 8 bytes past the start of data (for double
   40  * word alignment).  We cannot just use offsets because clusters are not at
   41  * a fixed offset from the associated mbuf.  Sorry for this kludge.
   42  */
   43 #define malloc(size, type, canwait)                             \
   44 bpf_alloc(size, (canwait & M_NOWAIT) ? M_DONTWAIT : M_TRYWAIT)
   45 
   46 #define free(cp, type) m_free(*(struct mbuf **)(cp - 8))
   47 
   48 /* This mapping works for our purposes. */
   49 #define ERESTART EINTR
   50 
   51 #endif

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