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1 /*
2  * Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
3  * Copyright (c) 2007-2012 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_COMPAT_H_
28 #define _EVENT2_EVENT_COMPAT_H_
29 
30 /** @file event2/event_compat.h
31 
32   Potentially non-threadsafe versions of the functions in event.h: provided
33   only for backwards compatibility.
34 
35   In the oldest versions of Libevent, event_base was not a first-class
36   structure.  Instead, there was a single event base that every function
37   manipulated.  Later, when separate event bases were added, the old functions
38   that didn't take an event_base argument needed to work by manipulating the
39   "current" event base.  This could lead to thread-safety issues, and obscure,
40   hard-to-diagnose bugs.
41 
42   @deprecated All functions in this file are by definition deprecated.
43  */
44 
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48 
49 #include <event2/event-config.h>
50 #ifdef _EVENT_HAVE_SYS_TYPES_H
51 #include <sys/types.h>
52 #endif
53 #ifdef _EVENT_HAVE_SYS_TIME_H
54 #include <sys/time.h>
55 #endif
56 
57 /* For int types. */
58 #include <event2/util.h>
59 
60 /**
61   Initialize the event API.
62 
63   The event API needs to be initialized with event_init() before it can be
64   used.  Sets the global current base that gets used for events that have no
65   base associated with them.
66 
67   @deprecated This function is deprecated because it replaces the "current"
68     event_base, and is totally unsafe for multithreaded use.  The replacement
69     is event_base_new().
70 
71   @see event_base_set(), event_base_new()
72  */
73 struct event_base *event_init(void);
74 
75 /**
76   Loop to process events.
77 
78   Like event_base_dispatch(), but uses the "current" base.
79 
80   @deprecated This function is deprecated because it is easily confused by
81     multiple calls to event_init(), and because it is not safe for
82     multithreaded use.  The replacement is event_base_dispatch().
83 
84   @see event_base_dispatch(), event_init()
85  */
86 int event_dispatch(void);
87 
88 /**
89   Handle events.
90 
91   This function behaves like event_base_loop(), but uses the "current" base
92 
93   @deprecated This function is deprecated because it uses the event base from
94     the last call to event_init, and is therefore not safe for multithreaded
95     use.  The replacement is event_base_loop().
96 
97   @see event_base_loop(), event_init()
98 */
99 int event_loop(int);
100 
101 
102 /**
103   Exit the event loop after the specified time.
104 
105   This function behaves like event_base_loopexit(), except that it uses the
106   "current" base.
107 
108   @deprecated This function is deprecated because it uses the event base from
109     the last call to event_init, and is therefore not safe for multithreaded
110     use.  The replacement is event_base_loopexit().
111 
112   @see event_init, event_base_loopexit()
113   */
114 int event_loopexit(const struct timeval *);
115 
116 
117 /**
118   Abort the active event_loop() immediately.
119 
120   This function behaves like event_base_loopbreakt(), except that it uses the
121   "current" base.
122 
123   @deprecated This function is deprecated because it uses the event base from
124     the last call to event_init, and is therefore not safe for multithreaded
125     use.  The replacement is event_base_loopbreak().
126 
127   @see event_base_loopbreak(), event_init()
128  */
129 int event_loopbreak(void);
130 
131 /**
132   Schedule a one-time event to occur.
133 
134   @deprecated This function is obsolete, and has been replaced by
135     event_base_once(). Its use is deprecated because it relies on the
136     "current" base configured by event_init().
137 
138   @see event_base_once()
139  */
140 int event_once(evutil_socket_t , short,
141     void (*)(evutil_socket_t, short, void *), void *, const struct timeval *);
142 
143 
144 /**
145   Get the kernel event notification mechanism used by Libevent.
146 
147   @deprecated This function is obsolete, and has been replaced by
148     event_base_get_method(). Its use is deprecated because it relies on the
149     "current" base configured by event_init().
150 
151   @see event_base_get_method()
152  */
153 const char *event_get_method(void);
154 
155 
156 /**
157   Set the number of different event priorities.
158 
159   @deprecated This function is deprecated because it is easily confused by
160     multiple calls to event_init(), and because it is not safe for
161     multithreaded use.  The replacement is event_base_priority_init().
162 
163   @see event_base_priority_init()
164  */
165 int	event_priority_init(int);
166 
167 /**
168   Prepare an event structure to be added.
169 
170   @deprecated event_set() is not recommended for new code, because it requires
171      a subsequent call to event_base_set() to be safe under most circumstances.
172      Use event_assign() or event_new() instead.
173  */
174 void event_set(struct event *, evutil_socket_t, short, void (*)(evutil_socket_t, short, void *), void *);
175 
176 #define evtimer_set(ev, cb, arg)	event_set((ev), -1, 0, (cb), (arg))
177 #define evsignal_set(ev, x, cb, arg)	\
178 	event_set((ev), (x), EV_SIGNAL|EV_PERSIST, (cb), (arg))
179 
180 
181 /**
182    @name timeout_* macros
183 
184    @deprecated These macros are deprecated because their naming is inconsistent
185      with the rest of Libevent.  Use the evtimer_* macros instead.
186    @{
187  */
188 #define timeout_add(ev, tv)		event_add((ev), (tv))
189 #define timeout_set(ev, cb, arg)	event_set((ev), -1, 0, (cb), (arg))
190 #define timeout_del(ev)			event_del(ev)
191 #define timeout_pending(ev, tv)		event_pending((ev), EV_TIMEOUT, (tv))
192 #define timeout_initialized(ev)		event_initialized(ev)
193 /**@}*/
194 
195 /**
196    @name signal_* macros
197 
198    @deprecated These macros are deprecated because their naming is inconsistent
199      with the rest of Libevent.  Use the evsignal_* macros instead.
200    @{
201  */
202 #define signal_add(ev, tv)		event_add((ev), (tv))
203 #define signal_set(ev, x, cb, arg)				\
204 	event_set((ev), (x), EV_SIGNAL|EV_PERSIST, (cb), (arg))
205 #define signal_del(ev)			event_del(ev)
206 #define signal_pending(ev, tv)		event_pending((ev), EV_SIGNAL, (tv))
207 #define signal_initialized(ev)		event_initialized(ev)
208 /**@}*/
209 
210 #ifndef EVENT_FD
211 /* These macros are obsolete; use event_get_fd and event_get_signal instead. */
212 #define EVENT_FD(ev)		((int)event_get_fd(ev))
213 #define EVENT_SIGNAL(ev)	event_get_signal(ev)
214 #endif
215 
216 #ifdef __cplusplus
217 }
218 #endif
219 
220 #endif /* _EVENT2_EVENT_COMPAT_H_ */
221