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