1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
/*
* Copyright (c) 2014, Vsevolod Stakhov
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
*
* THIS SOFTWARE IS PROVIDED BY 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 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 RDNS_EVENT_H_
#define RDNS_EVENT_H_
#include <event.h>
#include <stdlib.h>
#include <string.h>
#include "rdns.h"
#ifdef __cplusplus
extern "C" {
#endif
static void* rdns_libevent_add_read (void *priv_data, int fd, void *user_data);
static void rdns_libevent_del_read(void *priv_data, void *ev_data);
static void* rdns_libevent_add_write (void *priv_data, int fd, void *user_data);
static void rdns_libevent_del_write (void *priv_data, void *ev_data);
static void* rdns_libevent_add_timer (void *priv_data, double after, void *user_data);
static void* rdns_libevent_add_periodic (void *priv_data, double after,
rdns_periodic_callback cb, void *user_data);
static void rdns_libevent_del_periodic (void *priv_data, void *ev_data);
static void rdns_libevent_repeat_timer (void *priv_data, void *ev_data);
static void rdns_libevent_del_timer (void *priv_data, void *ev_data);
struct rdns_event_periodic_cbdata {
struct event *ev;
rdns_periodic_callback cb;
void *cbdata;
};
static void
rdns_bind_libevent (struct rdns_resolver *resolver, struct event_base *ev_base)
{
struct rdns_async_context ev_ctx = {
.add_read = rdns_libevent_add_read,
.del_read = rdns_libevent_del_read,
.add_write = rdns_libevent_add_write,
.del_write = rdns_libevent_del_write,
.add_timer = rdns_libevent_add_timer,
.add_periodic = rdns_libevent_add_periodic,
.del_periodic = rdns_libevent_del_periodic,
.repeat_timer = rdns_libevent_repeat_timer,
.del_timer = rdns_libevent_del_timer,
.cleanup = NULL
}, *nctx;
/* XXX: never got freed */
nctx = malloc (sizeof (struct rdns_async_context));
if (nctx != NULL) {
memcpy (nctx, &ev_ctx, sizeof (struct rdns_async_context));
nctx->data = ev_base;
}
rdns_resolver_async_bind (resolver, nctx);
}
static void
rdns_libevent_read_event (int fd, short what, void *ud)
{
rdns_process_read (fd, ud);
}
static void
rdns_libevent_write_event (int fd, short what, void *ud)
{
rdns_process_write (fd, ud);
}
static void
rdns_libevent_timer_event (int fd, short what, void *ud)
{
rdns_process_timer (ud);
}
static void
rdns_libevent_periodic_event (int fd, short what, void *ud)
{
struct rdns_event_periodic_cbdata *cbdata = ud;
cbdata->cb (cbdata->cbdata);
}
static void*
rdns_libevent_add_read (void *priv_data, int fd, void *user_data)
{
struct event *ev;
ev = malloc (sizeof (struct event));
if (ev != NULL) {
event_set (ev, fd, EV_READ | EV_PERSIST, rdns_libevent_read_event, user_data);
event_base_set (priv_data, ev);
event_add (ev, NULL);
}
return ev;
}
static void
rdns_libevent_del_read(void *priv_data, void *ev_data)
{
struct event *ev = ev_data;
if (ev != NULL) {
event_del (ev);
free (ev);
}
}
static void*
rdns_libevent_add_write (void *priv_data, int fd, void *user_data)
{
struct event *ev;
ev = malloc (sizeof (struct event));
if (ev != NULL) {
event_set (ev, fd, EV_WRITE | EV_PERSIST,
rdns_libevent_write_event, user_data);
event_base_set (priv_data, ev);
event_add (ev, NULL);
}
return ev;
}
static void
rdns_libevent_del_write (void *priv_data, void *ev_data)
{
struct event *ev = ev_data;
if (ev != NULL) {
event_del (ev);
free (ev);
}
}
#define rdns_event_double_to_tv(dbl, tv) do { \
(tv)->tv_sec = (int)(dbl); \
(tv)->tv_usec = ((dbl) - (int)(dbl))*1000*1000; \
} while(0)
static void*
rdns_libevent_add_timer (void *priv_data, double after, void *user_data)
{
struct event *ev;
struct timeval tv;
ev = malloc (sizeof (struct event));
if (ev != NULL) {
rdns_event_double_to_tv (after, &tv);
event_set (ev, -1, EV_TIMEOUT|EV_PERSIST, rdns_libevent_timer_event, user_data);
event_base_set (priv_data, ev);
event_add (ev, &tv);
}
return ev;
}
static void*
rdns_libevent_add_periodic (void *priv_data, double after,
rdns_periodic_callback cb, void *user_data)
{
struct event *ev;
struct timeval tv;
struct rdns_event_periodic_cbdata *cbdata = NULL;
ev = malloc (sizeof (struct event));
if (ev != NULL) {
cbdata = malloc (sizeof (struct rdns_event_periodic_cbdata));
if (cbdata != NULL) {
rdns_event_double_to_tv (after, &tv);
cbdata->cb = cb;
cbdata->cbdata = user_data;
cbdata->ev = ev;
event_set (ev, -1, EV_TIMEOUT|EV_PERSIST, rdns_libevent_periodic_event, cbdata);
event_base_set (priv_data, ev);
event_add (ev, &tv);
}
else {
free (ev);
return NULL;
}
}
return cbdata;
}
static void
rdns_libevent_del_periodic (void *priv_data, void *ev_data)
{
struct rdns_event_periodic_cbdata *cbdata = ev_data;
if (cbdata != NULL) {
event_del (cbdata->ev);
free (cbdata->ev);
free (cbdata);
}
}
static void
rdns_libevent_repeat_timer (void *priv_data, void *ev_data)
{
/* XXX: libevent hides timeval, so timeouts are persistent here */
}
#undef rdns_event_double_to_tv
static void
rdns_libevent_del_timer (void *priv_data, void *ev_data)
{
struct event *ev = ev_data;
if (ev != NULL) {
event_del (ev);
free (ev);
}
}
#ifdef __cplusplus
}
#endif
#endif /* RDNS_EV_H_ */
|
