/* $NetBSD: time-test.c,v 1.1.1.3 2021/04/07 02:43:15 christos Exp $ */ /* * 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 #include #include #ifndef _WIN32 #include #include #endif #include #ifdef EVENT__HAVE_SYS_TIME_H #include #endif #include #include #include #include #include #include #include #include #ifdef _WIN32 #include #endif 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; evutil_timerclear(&tv); tv.tv_sec = 2; event_add(timeout, &tv); } } int main(int argc, char **argv) { struct event timeout; struct timeval tv; struct event_base *base; int flags; #ifdef _WIN32 WORD wVersionRequested; WSADATA wsaData; wVersionRequested = MAKEWORD(2, 2); (void)WSAStartup(wVersionRequested, &wsaData); #endif if (argc == 2 && !strcmp(argv[1], "-p")) { event_is_persistent = 1; flags = EV_PERSIST; } else { event_is_persistent = 0; flags = 0; } /* Initialize the event library */ base = event_base_new(); /* Initialize one event */ event_assign(&timeout, base, -1, flags, timeout_cb, (void*) &timeout); evutil_timerclear(&tv); tv.tv_sec = 2; event_add(&timeout, &tv); evutil_gettimeofday(&lasttime, NULL); setbuf(stdout, NULL); setbuf(stderr, NULL); event_base_dispatch(base); return (0); }