libevent_study/test_event_server/test_event_server.cpp

#include <iostream>
#include <event2/event.h>
#include <string.h>
#include <thread>
#include <errno.h>

#define SPORT 5001
#ifdef _WIN32
	
#else
	#include <signal.h>
#endif // !_WIN32

using namespace std;
//正常断开连接也会进入  超时会进入
void client_cb(evutil_socket_t s,short w,void *arg){
    //水平触发LT 只要有数据没处理会 一直进入
    //边缘触发ET 有数据时只触发一次
    event *ev = (event *) arg;
    if(w&EV_TIMEOUT){
       cout << "timeout" << endl;
        //需要清理event
        event_free(ev);
        evutil_closesocket(s);
        return;
    }

    char buf[1024]= {0};
    int len = recv(s,buf,sizeof(buf)-1,0);
    if(len > 0){
        cout << buf << flush;
        send(s,"ok",2,0);
    }
    else{
        //需要清理event
        cout << "event_free" << endl;
        event_free(ev);
        evutil_closesocket(s);
    }
    
}


void listen_cb(evutil_socket_t s,short w,void *arg){
    cout << "listen_cb" << endl;

    sockaddr_in sin;
    socklen_t size = sizeof(sin);
    //读取连接信息
    evutil_socket_t client = accept(s,(sockaddr*)&sin,&size);
    char ip[16] = {0};
    evutil_inet_ntop(AF_INET,&sin.sin_addr,ip,sizeof(ip)-1);
    cout << "client ip is " << ip << endl;

    //客户端数据读取事件
    event_base *base = (event_base*)arg;
    event *ev = event_new(base,client,EV_READ|EV_PERSIST ,client_cb,event_self_cbarg());
    
    timeval t = {10,0};

    event_add(ev,&t);
}

int main(int agrc,char** agrv){
#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

    event_base *base = event_base_new();

    cout << "test event server" << endl;

    evutil_socket_t sock = socket(AF_INET,SOCK_STREAM,0);
    if(sock == 0){
        cout << "socket error:" << strerror(errno) << endl;
        return -1;
    }

    //绑定端口地址
    sockaddr_in sin;
    memset(&sin,0,sizeof(sin));
    sin.sin_family = AF_INET;
    sin.sin_port = htons(SPORT);
    int re = ::bind(sock,(sockaddr*)&sin,sizeof(sin));
    if(re != 0){
        cerr << "bind error: " << strerror(errno) << endl;
        return -1;
    }

    //设置地址复用和非阻塞
    evutil_make_socket_nonblocking(sock);
    evutil_make_listen_socket_reuseable(sock);

    //开始监听
    listen(sock,10);

    //开始接收连接事件
    event *ev = event_new(base,sock,EV_READ|EV_PERSIST /* |EV_ET*/  ,listen_cb,base); //默认水平触发
    event_add(ev,0);

    //进入事件主循环
    event_base_dispatch(base);
    evutil_closesocket(sock);
    event_base_free(base);
   
    return 0;

}