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193c06a7ed
fragmentation in evbuffer_expand by increasing the size of the last buffer in the chain; as a result with have to keep track of the previous_to_last chain; provide a evbuffer_validate() function in the regression test to make sure that all evbuffer are internally consistent. svn:r699
77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/*
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* Copyright (c) 2000-2004 Niels Provos <provos@citi.umich.edu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _EVBUFFER_INTERNAL_H_
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#define _EVBUFFER_INTERNAL_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "config.h"
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#include "evutil.h"
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/* minimum allocation */
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#define MIN_BUFFER_SIZE 256
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/* number of iovec we use for writev, fragmentation is going to determine
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* how much we end up writing */
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#define NUM_IOVEC 128
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struct evbuffer_chain;
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struct evbuffer {
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struct evbuffer_chain *first;
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struct evbuffer_chain *last;
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struct evbuffer_chain *previous_to_last;
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size_t total_len; /* total length of all buffers */
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void (*cb)(struct evbuffer *, size_t, size_t, void *);
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void *cbarg;
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};
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struct evbuffer_chain {
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/** points to next buffer in the chain */
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struct evbuffer_chain *next;
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size_t buffer_len; /**< total allocation available in the buffer field. */
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size_t misalign; /**< unused space at the beginning of buffer */
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size_t off; /**< Offset into buffer + misalign at which to start writing.
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* In other words, the total number of bytes actually stored
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* in buffer. */
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u_char buffer[1];
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};
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#define EVBUFFER_CHAIN_SIZE offsetof(struct evbuffer_chain, buffer[0])
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#ifdef __cplusplus
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}
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#endif
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#endif /* _EVBUFFER_INTERNAL_H_ */
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