michael@0: /*
michael@0:  * XXX This sample code was once meant to show how to use the basic Libevent
michael@0:  * interfaces, but it never worked on non-Unix platforms, and some of the
michael@0:  * interfaces have changed since it was first written.  It should probably
michael@0:  * be removed or replaced with something better.
michael@0:  *
michael@0:  * Compile with:
michael@0:  * cc -I/usr/local/include -o time-test time-test.c -L/usr/local/lib -levent
michael@0:  */
michael@0: 
michael@0: #include <sys/types.h>
michael@0: 
michael@0: #include <event2/event-config.h>
michael@0: 
michael@0: #include <sys/stat.h>
michael@0: #ifndef WIN32
michael@0: #include <sys/queue.h>
michael@0: #include <unistd.h>
michael@0: #endif
michael@0: #include <time.h>
michael@0: #ifdef _EVENT_HAVE_SYS_TIME_H
michael@0: #include <sys/time.h>
michael@0: #endif
michael@0: #include <fcntl.h>
michael@0: #include <stdlib.h>
michael@0: #include <stdio.h>
michael@0: #include <string.h>
michael@0: #include <errno.h>
michael@0: 
michael@0: #include <event2/event.h>
michael@0: #include <event2/event_struct.h>
michael@0: #include <event2/util.h>
michael@0: 
michael@0: #ifdef WIN32
michael@0: #include <winsock2.h>
michael@0: #endif
michael@0: 
michael@0: struct timeval lasttime;
michael@0: 
michael@0: int event_is_persistent;
michael@0: 
michael@0: static void
michael@0: timeout_cb(evutil_socket_t fd, short event, void *arg)
michael@0: {
michael@0: 	struct timeval newtime, difference;
michael@0: 	struct event *timeout = arg;
michael@0: 	double elapsed;
michael@0: 
michael@0: 	evutil_gettimeofday(&newtime, NULL);
michael@0: 	evutil_timersub(&newtime, &lasttime, &difference);
michael@0: 	elapsed = difference.tv_sec +
michael@0: 	    (difference.tv_usec / 1.0e6);
michael@0: 
michael@0: 	printf("timeout_cb called at %d: %.3f seconds elapsed.\n",
michael@0: 	    (int)newtime.tv_sec, elapsed);
michael@0: 	lasttime = newtime;
michael@0: 
michael@0: 	if (! event_is_persistent) {
michael@0: 		struct timeval tv;
michael@0: 		evutil_timerclear(&tv);
michael@0: 		tv.tv_sec = 2;
michael@0: 		event_add(timeout, &tv);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: int
michael@0: main(int argc, char **argv)
michael@0: {
michael@0: 	struct event timeout;
michael@0: 	struct timeval tv;
michael@0: 	struct event_base *base;
michael@0: 	int flags;
michael@0: 
michael@0: #ifdef WIN32
michael@0: 	WORD wVersionRequested;
michael@0: 	WSADATA wsaData;
michael@0: 
michael@0: 	wVersionRequested = MAKEWORD(2, 2);
michael@0: 
michael@0: 	(void)WSAStartup(wVersionRequested, &wsaData);
michael@0: #endif
michael@0: 
michael@0: 	if (argc == 2 && !strcmp(argv[1], "-p")) {
michael@0: 		event_is_persistent = 1;
michael@0: 		flags = EV_PERSIST;
michael@0: 	} else {
michael@0: 		event_is_persistent = 0;
michael@0: 		flags = 0;
michael@0: 	}
michael@0: 
michael@0: 	/* Initalize the event library */
michael@0: 	base = event_base_new();
michael@0: 
michael@0: 	/* Initalize one event */
michael@0: 	event_assign(&timeout, base, -1, flags, timeout_cb, (void*) &timeout);
michael@0: 
michael@0: 	evutil_timerclear(&tv);
michael@0: 	tv.tv_sec = 2;
michael@0: 	event_add(&timeout, &tv);
michael@0: 
michael@0: 	evutil_gettimeofday(&lasttime, NULL);
michael@0: 
michael@0: 	event_base_dispatch(base);
michael@0: 
michael@0: 	return (0);
michael@0: }
michael@0: