111 lines
2.2 KiB
C
111 lines
2.2 KiB
C
/*
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* XXX This sample code was once meant to show how to use the basic Libevent
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* interfaces, but it never worked on non-Unix platforms, and some of the
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* interfaces have changed since it was first written. It should probably
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* be removed or replaced with something better.
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*
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* Compile with:
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* cc -I/usr/local/include -o time-test time-test.c -L/usr/local/lib -levent
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*/
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#include <sys/types.h>
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#include <event2/event-config.h>
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#include <sys/stat.h>
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#ifndef _WIN32
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#include <sys/queue.h>
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#include <unistd.h>
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#endif
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#include <time.h>
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#ifdef EVENT__HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <event2/event.h>
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#include <event2/event_struct.h>
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#include <event2/util.h>
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#ifdef _WIN32
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#include <winsock2.h>
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#endif
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struct timeval lasttime;
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int event_is_persistent;
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static void
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timeout_cb(evutil_socket_t fd, short event, void *arg)
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{
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struct timeval newtime, difference;
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struct event *timeout = arg;
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double elapsed;
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evutil_gettimeofday(&newtime, NULL);
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evutil_timersub(&newtime, &lasttime, &difference);
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elapsed = difference.tv_sec +
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(difference.tv_usec / 1.0e6);
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printf("timeout_cb called at %d: %.3f seconds elapsed.\n",
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(int)newtime.tv_sec, elapsed);
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lasttime = newtime;
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if (! event_is_persistent) {
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struct timeval tv;
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evutil_timerclear(&tv);
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tv.tv_sec = 2;
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event_add(timeout, &tv);
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}
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}
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int
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main(int argc, char **argv)
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{
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struct event timeout;
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struct timeval tv;
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struct event_base *base;
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int flags;
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#ifdef _WIN32
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WORD wVersionRequested;
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WSADATA wsaData;
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wVersionRequested = MAKEWORD(2, 2);
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(void)WSAStartup(wVersionRequested, &wsaData);
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#endif
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if (argc == 2 && !strcmp(argv[1], "-p")) {
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event_is_persistent = 1;
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flags = EV_PERSIST;
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} else {
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event_is_persistent = 0;
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flags = 0;
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}
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/* Initalize the event library */
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base = event_base_new();
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/* Initalize one event */
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event_assign(&timeout, base, -1, flags, timeout_cb, (void*) &timeout);
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evutil_timerclear(&tv);
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tv.tv_sec = 2;
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event_add(&timeout, &tv);
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evutil_gettimeofday(&lasttime, NULL);
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setbuf(stdout, NULL);
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setbuf(stderr, NULL);
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event_base_dispatch(base);
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return (0);
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}
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