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/*-
* Copyright (c) 2006 Verdens Gang AS
* Copyright (c) 2006-2015 Varnish Software AS
* All rights reserved.
*
* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
* Author: Martin Blix Grydeland <martin@varnish-software.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*
* 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 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.
*
* Define the layout of the shared memory log segment.
*
* NB: THIS IS NOT A PUBLIC API TO VARNISH!
*/
#ifdef VSL_PRIV_H_INCLUDED
# error "vsl_priv.h included more than once"
#endif
#define VSL_PRIV_H_INCLUDED
#include "vapi/vsl_int.h"
/*
* Shared memory log format
*
* The segments array has index values providing safe entry points into
* the log, where each element N gives the index of the first log record
* in the Nth segment of the log. An index value of -1 indicates that no
* log records in this segment exists.
*
* The segment_n member is incremented only, natively wrapping at
* UINT_MAX. When taken modulo VSL_SEGMENTS, it gives the current index
* into the offset array.
*
* The format of the actual log is in vapi/vsl_int.h
*
*/
struct VSL_head {
#define VSL_HEAD_MARKER "VSLHEAD2" /* Incr. as version# */
char marker[8];
ssize_t segsize;
unsigned segment_n;
ssize_t offset[VSL_SEGMENTS];
uint32_t log[] v_counted_by_(segment_n);
};
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