利用libevent的timer实现定时器interval

在不怎么了解libevent的情况下，看到timer这个关键字想到可以用来做定时任务，官方资料也不齐全，就从代码里看到了TIMEOUT字样，这么说来应该是支持timeout了，那interval呢，貌似没有发现更好的办法，姑且在timeout里再timeout一次吧，留代码备用。

 #include <stdio.h>
 #include <stdlib.h>
 #include <event2/event.h>

 typedef struct {
         struct timeval tv;
         struct event * ev;
 } timer_param_t;

 void timer_task(int fd, short events, void * ctx) {
         printf("...\n");

         timer_param_t * param = (timer_param_t *) ctx;
         evtimer_add(param->ev, &param->tv);
 }

 int main() {
         struct event_base * base;
         base = event_base_new();
         if(!base) {
                 printf("open event base error\n");
                 return -;
         }
         timer_param_t * param = calloc(, sizeof(timer_param_t));
         param->ev = evtimer_new(base, timer_task, param);
         param->tv.tv_sec = ;
         evtimer_add(param->ev, &param->tv);
         int err = event_base_dispatch(base);
         printf("error = %d\n", err);
         return ;
 }

编译：gcc -o timer timer.c -levent