libevent之evtimer试用

#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <event.h>
void time_cb(int fd, short event, void *arg)
{
    struct timeval tv;
    struct event *ev = NULL;
    // add your code here

    fprintf(stderr, "Hello, evtimer\n");
    ev = malloc(sizeof(struct event));
    tv.tv_sec = 0;
    tv.tv_usec = 50000L;
    evtimer_set(ev, time_cb, ev);
    evtimer_add(ev, &tv);
}
int main(int argc, char *argv)
{
    struct timeval tv;
    struct event *ev = NULL;
    event_init();
    ev = malloc(sizeof(struct event));
    tv.tv_sec = 0;
    tv.tv_usec = 50000L;
    evtimer_set(ev, time_cb, ev);
    evtimer_add(ev, &tv);
    event_dispatch();
    return 0;
}