release/src/router/libevent/include/event2/bufferevent_struct.h

   1 /*
   2  * Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
   3  * Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27 #ifndef _EVENT2_BUFFEREVENT_STRUCT_H_
  28 #define _EVENT2_BUFFEREVENT_STRUCT_H_
  29
  30 /** @file bufferevent_struct.h
  31
  32   Data structures for bufferevents.  Using these structures may hurt forward
  33   compatibility with later versions of Libevent: be careful!
  34
  35  */
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 #include <event2/event-config.h>
  42 #ifdef _EVENT_HAVE_SYS_TYPES_H
  43 #include <sys/types.h>
  44 #endif
  45 #ifdef _EVENT_HAVE_SYS_TIME_H
  46 #include <sys/time.h>
  47 #endif
  48
  49 /* For int types. */
  50 #include <event2/util.h>
  51 /* For struct event */
  52 #include <event2/event_struct.h>
  53
  54 struct event_watermark {
  55         size_t low;
  56         size_t high;
  57 };
  58
  59 /**
  60   Shared implementation of a bufferevent.
  61
  62   This type is exposed only because it was exposed in previous versions,
  63   and some people's code may rely on manipulating it.  Otherwise, you
  64   should really not rely on the layout, size, or contents of this structure:
  65   it is fairly volatile, and WILL change in future versions of the code.
  66 **/
  67 struct bufferevent {
  68         /** Event base for which this bufferevent was created. */
  69         struct event_base *ev_base;
  70         /** Pointer to a table of function pointers to set up how this
  71             bufferevent behaves. */
  72         const struct bufferevent_ops *be_ops;
  73
  74         /** A read event that triggers when a timeout has happened or a socket
  75             is ready to read data.  Only used by some subtypes of
  76             bufferevent. */
  77         struct event ev_read;
  78         /** A write event that triggers when a timeout has happened or a socket
  79             is ready to write data.  Only used by some subtypes of
  80             bufferevent. */
  81         struct event ev_write;
  82
  83         /** An input buffer. Only the bufferevent is allowed to add data to
  84             this buffer, though the user is allowed to drain it. */
  85         struct evbuffer *input;
  86
  87         /** An input buffer. Only the bufferevent is allowed to drain data
  88             from this buffer, though the user is allowed to add it. */
  89         struct evbuffer *output;
  90
  91         struct event_watermark wm_read;
  92         struct event_watermark wm_write;
  93
  94         bufferevent_data_cb readcb;
  95         bufferevent_data_cb writecb;
  96         /* This should be called 'eventcb', but renaming it would break
  97          * backward compatibility */
  98         bufferevent_event_cb errorcb;
  99         void *cbarg;
 100
 101         struct timeval timeout_read;
 102         struct timeval timeout_write;
 103
 104         /** Events that are currently enabled: currently EV_READ and EV_WRITE
 105             are supported. */
 106         short enabled;
 107 };
 108
 109 #ifdef __cplusplus
 110 }
 111 #endif
 112
 113 #endif /* _EVENT2_BUFFEREVENT_STRUCT_H_ */