1 /*
2 * XXX This sample code was once meant to show how to use the basic Libevent
3 * interfaces, but it never worked on non-Unix platforms, and some of the
4 * interfaces have changed since it was first written. It should probably
5 * be removed or replaced with something better.
6 *
7 * Compile with:
8 * cc -I/usr/local/include -o time-test time-test.c -L/usr/local/lib -levent
9 */
10
11 #include <sys/types.h>
12
13 #include <event2/event-config.h>
14
15 #include <sys/stat.h>
16 #ifndef _WIN32
17 #include <sys/queue.h>
18 #include <unistd.h>
19 #endif
20 #include <time.h>
21 #ifdef EVENT__HAVE_SYS_TIME_H
22 #include <sys/time.h>
23 #endif
24 #include <fcntl.h>
25 #include <stdlib.h>
26 #include <stdio.h>
27 #include <string.h>
28 #include <errno.h>
29
30 #include <event2/event.h>
31 #include <event2/event_struct.h>
32 #include <event2/util.h>
33
34 #ifdef _WIN32
35 #include <winsock2.h>
36 #endif
37
38 struct timeval lasttime;
39
40 int event_is_persistent;
41
42 static void
timeout_cb(evutil_socket_t fd,short event,void * arg)43 timeout_cb(evutil_socket_t fd, short event, void *arg)
44 {
45 struct timeval newtime, difference;
46 struct event *timeout = arg;
47 double elapsed;
48
49 evutil_gettimeofday(&newtime, NULL);
50 evutil_timersub(&newtime, &lasttime, &difference);
51 elapsed = difference.tv_sec +
52 (difference.tv_usec / 1.0e6);
53
54 printf("timeout_cb called at %d: %.3f seconds elapsed.\n",
55 (int)newtime.tv_sec, elapsed);
56 lasttime = newtime;
57
58 if (! event_is_persistent) {
59 struct timeval tv;
60 evutil_timerclear(&tv);
61 tv.tv_sec = 2;
62 event_add(timeout, &tv);
63 }
64 }
65
66 int
main(int argc,char ** argv)67 main(int argc, char **argv)
68 {
69 struct event timeout;
70 struct timeval tv;
71 struct event_base *base;
72 int flags;
73
74 #ifdef _WIN32
75 WORD wVersionRequested;
76 WSADATA wsaData;
77
78 wVersionRequested = MAKEWORD(2, 2);
79
80 (void)WSAStartup(wVersionRequested, &wsaData);
81 #endif
82
83 if (argc == 2 && !strcmp(argv[1], "-p")) {
84 event_is_persistent = 1;
85 flags = EV_PERSIST;
86 } else {
87 event_is_persistent = 0;
88 flags = 0;
89 }
90
91 /* Initalize the event library */
92 base = event_base_new();
93
94 /* Initalize one event */
95 event_assign(&timeout, base, -1, flags, timeout_cb, (void*) &timeout);
96
97 evutil_timerclear(&tv);
98 tv.tv_sec = 2;
99 event_add(&timeout, &tv);
100
101 evutil_gettimeofday(&lasttime, NULL);
102
103 event_base_dispatch(base);
104
105 return (0);
106 }
107
108