1/*	$NetBSD: time-test.c,v 1.1.1.3 2021/04/07 02:43:15 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
39struct timeval lasttime;
40
41int event_is_persistent;
42
43static void
44timeout_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
67int
68main(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	/* Initialize the event library */
93	base = event_base_new();
94
95	/* Initialize 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	setbuf(stdout, NULL);
105	setbuf(stderr, NULL);
106
107	event_base_dispatch(base);
108
109	return (0);
110}
111
112