poll服务器

想详细彻底地了解poll或看懂下面的代码请参考《Linux网络编程——I/O复用之poll函数》

代码：
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include

include

include

include

include

include

include

include

include

include

include

define OPEN_MAX 100

int main(int argc, char *argv[])
{
//1.创建tcp监听套接字
int sockfd = socket(AF_INET, SOCK_STREAM, 0);

//2.绑定sockfd  
struct sockaddr_in my_addr;  
bzero(&my_addr, sizeof(my_addr));  
my_addr.sin_family = AF_INET;  
my_addr.sin_port = htons(8000);  
my_addr.sin_addr.s_addr = htonl(INADDR_ANY);  
bind(sockfd, (struct sockaddr *)&my_addr, sizeof(my_addr));  

//3.监听listen  
listen(sockfd, 10);  

//4.poll相应参数准备  
struct pollfd client[OPEN_MAX];  
int i = 0, maxi = 0;  
for(;i maxi)  
            maxi = i;  

        //5.1.4 如果没有就绪的描述符，就继续poll监测，否则继续向下看  
        if(--ret <= 0)  
            continue;  
    }  

    //5.2继续响应就绪的描述符  
    for(i=1; i<=maxi; i++)  
    {  
        if(client[i].fd < 0)  
            continue;  

        if(client[i].revents & (POLLIN | POLLERR))  
        {  
            int len = 0;  
            char buf[128] = "";  

            //5.2.1接受客户端数据  
            if((len = recv(client[i].fd, buf, sizeof(buf), 0)) < 0)  
            {  
                if(errno == ECONNRESET)//tcp连接超时、RST  
                {  
                    close(client[i].fd);  
                    client[i].fd = -1;  
                }  
                else  
                    perror("read error:");  

            }  
            else if(len == 0)//客户端关闭连接  
            {  
                close(client[i].fd);  
                client[i].fd = -1;  
            }  
            else//正常接收到服务器的数据  
                send(client[i].fd, buf, len, 0);  

            //5.2.2所有的就绪描述符处理完了，就退出当前的for循环，继续poll监测  
            if(--ret <= 0)  
                break;  

        }  
    }  
}  
return 0;  

}