mirror of
https://github.com/libevent/libevent.git
synced 2025-01-09 00:56:20 +08:00
117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/*
|
|
* Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
|
|
* Copyright (c) 2007-2009 Niels Provos and Nick Mathewson
|
|
*
|
|
* 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;
|
|
ev_uint32_t flags;
|
|
size_t size_before_suspend;
|
|
};
|
|
|
|
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_ */
|