1 /* 2 * XXX This sample code was once meant to show how to use the basic Libevent 3 * interfaces, but it never worked on non-Unix platforms, and some of the 4 * interfaces have changed since it was first written. It should probably 5 * be removed or replaced with something better. 6 * 7 * Compile with: 8 * cc -I/usr/local/include -o time-test time-test.c -L/usr/local/lib -levent 9 */ 10 11 #include <sys/types.h> 12 13 #include <event2/event-config.h> 14 15 #include <sys/stat.h> 16 #ifndef _WIN32 17 #include <sys/queue.h> 18 #include <unistd.h> 19 #endif 20 #include <time.h> 21 #ifdef EVENT__HAVE_SYS_TIME_H 22 #include <sys/time.h> 23 #endif 24 #include <fcntl.h> 25 #include <stdlib.h> 26 #include <stdio.h> 27 #include <string.h> 28 #include <errno.h> 29 30 #include <event2/event.h> 31 #include <event2/event_struct.h> 32 #include <event2/util.h> 33 34 #ifdef _WIN32 35 #include <winsock2.h> 36 #endif 37 38 struct timeval lasttime; 39 40 int event_is_persistent; 41 42 static void 43 timeout_cb(evutil_socket_t fd, short event, void *arg) 44 { 45 struct timeval newtime, difference; 46 struct event *timeout = arg; 47 double elapsed; 48 49 evutil_gettimeofday(&newtime, NULL); 50 evutil_timersub(&newtime, &lasttime, &difference); 51 elapsed = difference.tv_sec + 52 (difference.tv_usec / 1.0e6); 53 54 printf("timeout_cb called at %d: %.3f seconds elapsed.\n", 55 (int)newtime.tv_sec, elapsed); 56 lasttime = newtime; 57 58 if (! event_is_persistent) { 59 struct timeval tv; 60 evutil_timerclear(&tv); 61 tv.tv_sec = 2; 62 event_add(timeout, &tv); 63 } 64 } 65 66 int 67 main(int argc, char **argv) 68 { 69 struct event timeout; 70 struct timeval tv; 71 struct event_base *base; 72 int flags; 73 74 #ifdef _WIN32 75 WORD wVersionRequested; 76 WSADATA wsaData; 77 78 wVersionRequested = MAKEWORD(2, 2); 79 80 (void)WSAStartup(wVersionRequested, &wsaData); 81 #endif 82 83 if (argc == 2 && !strcmp(argv[1], "-p")) { 84 event_is_persistent = 1; 85 flags = EV_PERSIST; 86 } else { 87 event_is_persistent = 0; 88 flags = 0; 89 } 90 91 /* Initialize the event library */ 92 base = event_base_new(); 93 94 /* Initialize one event */ 95 event_assign(&timeout, base, -1, flags, timeout_cb, (void*) &timeout); 96 97 evutil_timerclear(&tv); 98 tv.tv_sec = 2; 99 event_add(&timeout, &tv); 100 101 evutil_gettimeofday(&lasttime, NULL); 102 103 setbuf(stdout, NULL); 104 setbuf(stderr, NULL); 105 106 event_base_dispatch(base); 107 108 return (0); 109 } 110 111