external/bsd/libevent/dist/sample/time-test.c

   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