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* XXX This sample code was once meant to show how to use the basic Libevent
* interfaces, but it never worked on non-Unix platforms, and some of the
* interfaces have changed since it was first written. It should probably
* be removed or replaced with something better.
* Compile with:
* cc -I/usr/local/include -o time-test time-test.c -L/usr/local/lib -levent
#include <sys/types.h>
#include <event2/event-config.h>
#include <sys/stat.h>
#ifndef _WIN32
#include <sys/queue.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <event2/event.h>
#include <event2/event_struct.h>
#include <event2/util.h>
#ifdef _WIN32
#include <winsock2.h>
struct timeval lasttime;
int event_is_persistent;
static void
timeout_cb(evutil_socket_t fd, short event, void *arg)
struct timeval newtime, difference;
struct event *timeout = arg;
double elapsed;
evutil_gettimeofday(&newtime, NULL);
evutil_timersub(&newtime, &lasttime, &difference);
elapsed = difference.tv_sec +
(difference.tv_usec / 1.0e6);
printf("timeout_cb called at %d: %.3f seconds elapsed.\n",
(int)newtime.tv_sec, elapsed);
lasttime = newtime;
if (! event_is_persistent) {
struct timeval tv;
tv.tv_sec = 2;
event_add(timeout, &tv);
main(int argc, char **argv)
struct event timeout;
struct timeval tv;
struct event_base *base;
int flags;
#ifdef _WIN32
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(2, 2);
err = WSAStartup(wVersionRequested, &wsaData);
if (argc == 2 && !strcmp(argv[1], "-p")) {
event_is_persistent = 1;
flags = EV_PERSIST;
} else {
event_is_persistent = 0;
flags = 0;
/* Initalize the event library */
base = event_base_new();
/* Initalize one event */
event_assign(&timeout, base, -1, flags, timeout_cb, (void*) &timeout);
tv.tv_sec = 2;
event_add(&timeout, &tv);
evutil_gettimeofday(&lasttime, NULL);
return (0);
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