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event_struct.h
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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_EVENT_STRUCT_H_
28 #define _EVENT2_EVENT_STRUCT_H_
29
30 /** @file event2/event_struct.h
31
32 Structures used by event.h. Using these structures directly WILL harm
33 forward compatibility: be careful.
34
35 No field declared in this file should be used directly in user code. Except
36 for historical reasons, these fields would not be exposed at all.
37 */
38
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42
43 #include <event2/event-config.h>
44 #ifdef _EVENT_HAVE_SYS_TYPES_H
45 #include <sys/types.h>
46 #endif
47 #ifdef _EVENT_HAVE_SYS_TIME_H
48 #include <sys/time.h>
49 #endif
50
51 /* For int types. */
52 #include <event2/util.h>
53
54 /* For evkeyvalq */
55 #include <event2/keyvalq_struct.h>
56
57 #define EVLIST_TIMEOUT 0x01
58 #define EVLIST_INSERTED 0x02
59 #define EVLIST_SIGNAL 0x04
60 #define EVLIST_ACTIVE 0x08
61 #define EVLIST_INTERNAL 0x10
62 #define EVLIST_INIT 0x80
63
64 /* EVLIST_X_ Private space: 0x1000-0xf000 */
65 #define EVLIST_ALL (0xf000 | 0x9f)
66
67 /* Fix so that people don't have to run with <sys/queue.h> */
68 #ifndef TAILQ_ENTRY
69 #define _EVENT_DEFINED_TQENTRY
70 #define TAILQ_ENTRY(type) \
71 struct { \
72 struct type *tqe_next; /* next element */ \
73 struct type **tqe_prev; /* address of previous next element */ \
74 }
75 #endif /* !TAILQ_ENTRY */
76
77 #ifndef TAILQ_HEAD
78 #define _EVENT_DEFINED_TQHEAD
79 #define TAILQ_HEAD(name, type) \
80 struct name { \
81 struct type *tqh_first; \
82 struct type **tqh_last; \
83 }
84 #endif
85
86 struct event_base;
87 struct event {
88 TAILQ_ENTRY(event) ev_active_next;
89 TAILQ_ENTRY(event) ev_next;
90 /* for managing timeouts */
91 union {
92 TAILQ_ENTRY(event) ev_next_with_common_timeout;
93 int min_heap_idx;
94 } ev_timeout_pos;
95 evutil_socket_t ev_fd;
96
97 struct event_base *ev_base;
98
99 union {
100 /* used for io events */
101 struct {
102 TAILQ_ENTRY(event) ev_io_next;
103 struct timeval ev_timeout;
104 } ev_io;
105
106 /* used by signal events */
107 struct {
108 TAILQ_ENTRY(event) ev_signal_next;
109 short ev_ncalls;
110 /* Allows deletes in callback */
111 short *ev_pncalls;
112 } ev_signal;
113 } _ev;
114
115 short ev_events;
116 short ev_res; /* result passed to event callback */
117 short ev_flags;
118 ev_uint8_t ev_pri; /* smaller numbers are higher priority */
119 ev_uint8_t ev_closure;
120 struct timeval ev_timeout;
121
122 /* allows us to adopt for different types of events */
123 void (*ev_callback)(evutil_socket_t, short, void *arg);
124 void *ev_arg;
125 };
126
127 TAILQ_HEAD (event_list, event);
128
129 #ifdef _EVENT_DEFINED_TQENTRY
130 #undef TAILQ_ENTRY
131 #endif
132
133 #ifdef _EVENT_DEFINED_TQHEAD
134 #undef TAILQ_HEAD
135 #endif
136
137 #ifdef __cplusplus
138 }
139 #endif
140
141 #endif /* _EVENT2_EVENT_STRUCT_H_ */
event
Structure to represent a single event.
Definition: event_struct.h:87
evutil_socket_t
#define evutil_socket_t
A type wide enough to hold the output of "socket()" or "accept()".
Definition: util.h:278
util.h
Common convenience functions for cross-platform portability and related socket manipulations.
event_base
Definition: event-internal.h:167