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/*
* 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 "event-config.h"
#include "evutil.h"
#include <sys/queue.h>
/* minimum allocation */
#define MIN_BUFFER_SIZE 256
struct evbuffer_cb_entry {
TAILQ_ENTRY(evbuffer_cb_entry) next;
evbuffer_cb cb;
void *cbarg;
unsigned flags;
};
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 */
evbuffer_cb cb;
void *cbarg;
TAILQ_HEAD(evbuffer_cb_queue, evbuffer_cb_entry) callbacks;
};
struct evbuffer_chain {
/** points to next buffer in the chain */
struct evbuffer_chain *next;
/** total allocation available in the buffer field. */
size_t buffer_len;
/** unused space at the beginning of buffer or an offset into a
* file for sendfile buffers. */
off_t misalign;
/** Offset into buffer + misalign at which to start writing.
* In other words, the total number of bytes actually stored
* in buffer. */
size_t off;
/** Set if special handling is required for this chain */
unsigned flags;
#define EVBUFFER_MMAP 0x0001 /**< memory in buffer is mmaped */
#define EVBUFFER_SENDFILE 0x0002 /**< a chain used for sendfile */
#define EVBUFFER_REFERENCE 0x0004 /**< a chain with a mem reference */
#define EVBUFFER_IMMUTABLE 0x0008 /**< read-only chain */
/** Usually points to the read-write memory belonging to this
* buffer allocated as part of the evbuffer_chain allocation.
* For mmap, this can be a read-only buffer and
* EVBUFFER_IMMUTABLE will be set in flags. For sendfile, it
* may point to NULL.
*/
u_char *buffer;
};
/* this is currently used by both mmap and sendfile */
/* TODO(niels): something strange needs to happen for Windows here, I am not
* sure what that is, but it needs to get looked into.
*/
struct evbuffer_chain_fd {
int fd; /**< the fd associated with this chain */
};
/* callback for reference buffer */
struct evbuffer_chain_reference {
void (*cleanupfn)(void *extra);
void *extra;
};
#define EVBUFFER_CHAIN_SIZE sizeof(struct evbuffer_chain)
#define EVBUFFER_CHAIN_EXTRA(t, c) (t *)((struct evbuffer_chain *)(c) + 1)
#ifdef __cplusplus
}
#endif
#endif /* _EVBUFFER_INTERNAL_H_ */
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