bufferevent客户端的实现

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <event2/bufferevent.h>
#include <event2/event.h>
#include <arpa/inet.h>

void read_cb(struct bufferevent *bev, void *arg)
{
    char buf[1024] = {0}; 
    bufferevent_read(bev, buf, sizeof(buf));

    bufferevent_write(bev, buf, strlen(buf)+1);
}

void write_cb(struct bufferevent *bev, void *arg)
{
    printf("我是一个白痴函数\n"); 
}

void event_cb(struct bufferevent *bev, short events, void *arg)
{
    if (events & BEV_EVENT_EOF)
    {
        printf("connection closed\n");  
    }
    else if(events & BEV_EVENT_ERROR)   
    {
        printf("some other error\n");
    }
    else if(events & BEV_EVENT_CONNECTED)
    {
        printf("已经连接到服务器\\(^o^)/...");
        return;
    }
    // 释放资源
    bufferevent_free(bev);
}

void read_terminal(evutil_socket_t fd, short what, void *arg)
{
    // 读数据
    char buf[1024] = {0};
    int len = read(fd, buf, sizeof(buf));
    struct bufferevent* bev = (struct bufferevent*)arg;
    // 发送数据
    bufferevent_write(bev, buf, len+1);
}

int main(int argc, const char* argv[])
{
    struct event_base* base = NULL;
    base = event_base_new();
    int fd = socket(AF_INET, SOCK_STREAM, 0);
    // 通信的fd放到bufferevent中
    struct bufferevent* bev = NULL;
    bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
    // init server info
    struct sockaddr_in serv;
    memset(&serv, 0, sizeof(serv));
    serv.sin_family = AF_INET;
    serv.sin_port = htons(8765);
    inet_pton(AF_INET, "127.0.0.1", &serv.sin_addr.s_addr);
    // 连接服务器
    bufferevent_socket_connect(bev, (struct sockaddr*)&serv, sizeof(serv));
    // 设置回调
    bufferevent_setcb(bev, read_cb, write_cb, event_cb, NULL);
    // 添加事件
    struct event* ev = event_new(base, STDIN_FILENO, EV_READ | EV_PERSIST,read_terminal, bev);
    event_add(ev, NULL);
    event_base_dispatch(base);
    event_free(ev);
    event_base_free(base);
    return 0;
}