Linux----IO框架库libevent的使用(永久事件及非永久性事件的实现)

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_41026740/article/details/83626641

iolib.c

执行此程序时命令为：gcc -o iolib iolib.c -levent

#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <signal.h>
#include <unistd.h>
#include <event.h>
#include <stdlib.h>

//libevent库的使用
void sig_cb(int fd, short ev, void *arg)
{
	printf("fd = %d\n", fd);
}

void timeout_cb(int fd, short ev, void *arg)
{
	printf("time out\n");
}

int main()
{
	struct event_base *base = event_init();
	assert(base != NULL);
	
	//struct event *sig_ev = event_new(base, SIGINT, sig_cb, NULL);非永久性事件
	struct event *sig_ev = event_new(base, SIGINT, EV_SIGNAL|EV_PERSIST, sig_cb, NULL);   //永久性事件,可以持续获取键盘数据
	assert(sig_cb != NULL);
	event_add(sig_ev, NULL);

	struct timeval tv = {3, 0};//超时时间

	//struct event *time_ev = event_new(base, timeout_cb, NULL); //非永久性事件
	struct event *time_ev = event_new(base, -1, EV_TIMEOUT|EV_PERSIST, timeout_cb, NULL);   //永久性事件，可以持续打印time out
	event_add(time_ev, &tv);

	event_base_dispatch(base);  //启动事件循环的方法
	event_free(time_ev);
	event_free(sig_ev);
	event_base_free(base);


}

结果显示：