kc3-lang/libevent/evbuffer-internal.h

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• Hash : 3ca22aa8
  Author :
  Date : 2008-05-15T03:05:10
  

   r19739@catbus:  nickm | 2008-05-14 23:05:03 -0400
   Use our offsetof; do not rely on platform offsetof
  
  
  svn:r825
  

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• evbuffer-internal.h

• /*
   * Copyright (c) 2000-2004 Niels Provos <provos@citi.umich.edu>
   * 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.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
   */
  #ifndef _EVBUFFER_INTERNAL_H_
  #define _EVBUFFER_INTERNAL_H_
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #include "config.h"
  #include "evutil.h"
  
  /* minimum allocation */
  #define MIN_BUFFER_SIZE	256
  
  /* number of iovec we use for writev, fragmentation is going to determine
   * how much we end up writing */
  #define NUM_IOVEC 128
  
  struct evbuffer_chain;
  struct evbuffer {
  	struct evbuffer_chain *first;
  	struct evbuffer_chain *last;
  	struct evbuffer_chain *previous_to_last;
  
  	size_t total_len;	/* total length of all buffers */
  
  	void (*cb)(struct evbuffer *, size_t, size_t, void *);
  	void *cbarg;
  };
  
  struct evbuffer_chain {
  	/** points to next buffer in the chain */
  	struct evbuffer_chain *next;
  	
  	size_t buffer_len; /**< total allocation available in the buffer field. */
  
  	size_t misalign; /**< unused space at the beginning of buffer */
  	size_t off;	/**< Offset into buffer + misalign at which to start writing.
  				 * In other words, the total number of bytes actually stored
  				 * in buffer. */
  
  	u_char buffer[1];
  };
  
  #define EVBUFFER_CHAIN_SIZE evutil_offsetof(struct evbuffer_chain, buffer[0])
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* _EVBUFFER_INTERNAL_H_ */
  

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