1 /*	$NetBSD: time-test.c,v 1.1.1.1 2013/04/11 16:43:31 christos Exp $	*/
2 /*
3  * XXX This sample code was once meant to show how to use the basic Libevent
4  * interfaces, but it never worked on non-Unix platforms, and some of the
5  * interfaces have changed since it was first written.  It should probably
6  * be removed or replaced with something better.
7  *
8  * Compile with:
9  * cc -I/usr/local/include -o time-test time-test.c -L/usr/local/lib -levent
10  */
11 
12 #include <sys/types.h>
13 
14 #include <event2/event-config.h>
15 
16 #include <sys/stat.h>
17 #ifndef WIN32
18 #include <sys/queue.h>
19 #include <unistd.h>
20 #endif
21 #include <time.h>
22 #ifdef _EVENT_HAVE_SYS_TIME_H
23 #include <sys/time.h>
24 #endif
25 #include <fcntl.h>
26 #include <stdlib.h>
27 #include <stdio.h>
28 #include <string.h>
29 #include <errno.h>
30 
31 #include <event2/event.h>
32 #include <event2/event_struct.h>
33 #include <event2/util.h>
34 
35 #ifdef WIN32
36 #include <winsock2.h>
37 #endif
38 
39 struct timeval lasttime;
40 
41 int event_is_persistent;
42 
43 static void
44 timeout_cb(evutil_socket_t fd, short event, void *arg)
45 {
46 	struct timeval newtime, difference;
47 	struct event *timeout = arg;
48 	double elapsed;
49 
50 	evutil_gettimeofday(&newtime, NULL);
51 	evutil_timersub(&newtime, &lasttime, &difference);
52 	elapsed = difference.tv_sec +
53 	    (difference.tv_usec / 1.0e6);
54 
55 	printf("timeout_cb called at %d: %.3f seconds elapsed.\n",
56 	    (int)newtime.tv_sec, elapsed);
57 	lasttime = newtime;
58 
59 	if (! event_is_persistent) {
60 		struct timeval tv;
61 		evutil_timerclear(&tv);
62 		tv.tv_sec = 2;
63 		event_add(timeout, &tv);
64 	}
65 }
66 
67 int
68 main(int argc, char **argv)
69 {
70 	struct event timeout;
71 	struct timeval tv;
72 	struct event_base *base;
73 	int flags;
74 
75 #ifdef WIN32
76 	WORD wVersionRequested;
77 	WSADATA wsaData;
78 
79 	wVersionRequested = MAKEWORD(2, 2);
80 
81 	(void)WSAStartup(wVersionRequested, &wsaData);
82 #endif
83 
84 	if (argc == 2 && !strcmp(argv[1], "-p")) {
85 		event_is_persistent = 1;
86 		flags = EV_PERSIST;
87 	} else {
88 		event_is_persistent = 0;
89 		flags = 0;
90 	}
91 
92 	/* Initalize the event library */
93 	base = event_base_new();
94 
95 	/* Initalize one event */
96 	event_assign(&timeout, base, -1, flags, timeout_cb, (void*) &timeout);
97 
98 	evutil_timerclear(&tv);
99 	tv.tv_sec = 2;
100 	event_add(&timeout, &tv);
101 
102 	evutil_gettimeofday(&lasttime, NULL);
103 
104 	event_base_dispatch(base);
105 
106 	return (0);
107 }
108 
109