libevent_study/test_libevent/test_libevent.cpp


#include <iostream>
#include<event2/event.h>
#include <event2/listener.h>
#include <string.h>
#ifndef _WIN32
#include <signal.h>
#endif // !_WIN32


#define SPORT 5001

void listen_cb(struct evconnlistener *, evutil_socket_t, struct sockaddr *, int socklen, void *arg) {
	std::cout << "listen to be" << std::endl;
}

int main()
{
#ifdef _WIN32
	//初始化socket库
	WSADATA wsa;
	WSAStartup(MAKEWORD(2, 2), &wsa);
#else 
	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) { //忽略管道信号，发送数据给已关闭的socket，会飞掉！
		return 1;
	}
#endif

	//创建libevent上下文
	event_base* base = event_base_new();
	if (base) {
		std::cout << "test server" << "\n";
	}

	
	sockaddr_in sin;
	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	sin.sin_port = htons(SPORT);

	//socket,bind listen  绑定事件
	evconnlistener * ev = evconnlistener_new_bind(base, //libevent上下文
		listen_cb, //接收到连接的回调函数
		base, //回调函数获取的参数(根据业务来)
		LEV_OPT_REUSEABLE | LEV_OPT_CLOSE_ON_FREE, //地址重用，evconnlistener关闭同时关闭socket
		10,  //连接队列大小，对应listen函数参数
		(sockaddr*)&sin,//绑定的地址和端口
		sizeof(sin)
	);

	if (base)
		event_base_dispatch(base); //事件分发处理
	if (ev)
		evconnlistener_free(ev);  //清理
	if (base)
		event_base_free(base);

#if _WIN32
	WSACleanup();
#endif // _WIN32



	return 0;
}