/usr/share/doc/libevent-dev/examples/time-test.c is in libevent-dev 2.0.21-stable-2ubuntu0.16.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | /*
* 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 <sys/types.h>
#include <event2/event-config.h>
#include <sys/stat.h>
#ifndef WIN32
#include <sys/queue.h>
#include <unistd.h>
#endif
#include <time.h>
#ifdef _EVENT_HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <event2/event.h>
#include <event2/event_struct.h>
#include <event2/util.h>
#ifdef WIN32
#include <winsock2.h>
#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;
}
/* Initalize the event library */
base = event_base_new();
/* Initalize 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);
event_base_dispatch(base);
return (0);
}
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