linux阻塞式网络小程序

/*server.c*/
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#define PORT			4321
#define BUFFER_SIZE		1024
#define MAX_PLAYERS	 3  //设定最大能连接的客户端数目
#define CARDS_NUM   54


int main()
{
	struct sockaddr_in server_sockaddr,client_sockaddr[3];
	int sin_size,recvbytes;
	int sockfd, client_fd[3];
	char buf[BUFFER_SIZE];
	int i, j,n;
	int nPlayers=0;//玩家计数，总共允许三个玩家
	char Cards[54];//表示54张牌
	char playerCards[3][17];//表示要发给三个玩家的牌，每个玩家17张牌
	int  card_select;
	
	/*建立socket连接*/
	if ((sockfd = socket(AF_INET,SOCK_STREAM,0))== -1)
	{
		perror("socket");
		exit(1);
	}
	printf("Server Socket id = %d\n",sockfd);
	
	/*设置sockaddr_in 结构体中相关参数*/
	server_sockaddr.sin_family = AF_INET;
	server_sockaddr.sin_port = htons(PORT);
	server_sockaddr.sin_addr.s_addr = INADDR_ANY; //注意结构体里面还有的结构体
	bzero(&(server_sockaddr.sin_zero), 8);  //包含在string.h头文件中
	
	int k = 1;/* 允许重复使用本地地址与套接字进行绑定 */
	setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &k, sizeof(i));  //	
	
	/*绑定函数bind()*/
	if (bind(sockfd, (struct sockaddr *)&server_sockaddr, //使用前将之前定义的地址结构类型强制转化为标准的IP地址结构体
sizeof(struct sockaddr)) == -1)
	{
		perror("bind");
		exit(1);  //包含在stdlib.h头文件中
	}
	printf("Bind success!\n");
	
	/*调用listen()函数，创建未处理请求的队列*/
	if (listen(sockfd, MAX_PLAYERS) == -1)
	{
		perror("listen");
		exit(1);
	}
	printf("Listening....\n");
	
	/*调用accept()函数，等待客户端的连接*/
	for(i=0; i<MAX_PLAYERS; i++)
	{
	    if ((client_fd[i] = accept(sockfd, (struct sockaddr *)&client_sockaddr[i], &sin_size)) == -1)  //获得三个不同套接字的描述符
		{
		    perror("accept");
		    exit(1);
		}
		nPlayers++;
		printf("Player %d is ready!\n", nPlayers);
	}

	
	printf("Ready to Send Cards!\n");
    sleep(3);  //包含在unistd.h头文件中

	//srand(time(systime));

	if(nPlayers==3)
	{
		
		for(n=0;n<54;n++)/*用1-54分别表示每一张牌*/
		{
            Cards[n] = n+1;
		}
		for (n=0;n<54;n++)//洗牌
		{
			/*随机选中一张牌，依次跟第n张牌交换位置*/
			card_select = (int)rand() %(CARDS_NUM);
		//	printf("%d ",card_select);
			char cardTemp = Cards[n];
			Cards[n] = Cards[card_select];
            Cards[card_select] = cardTemp;
		}
		
		for(i = 0; i<MAX_PLAYERS; i++)
			for( j=0;j<17;j++)
				{
                    playerCards[i][j] = Cards[i*17 + j];
				}

		for( i=0; i<MAX_PLAYERS; i++)
		{
			printf("Send cards to player %d\n", i+1);
			sleep(3);
                         
		    if(send(client_fd[i], playerCards[i], 17, 0) == -1)
			    close(client_fd[i]);  //如果发送出错，就关闭该套接字
		}
	}

	while(1)
	{
		 //接收某个玩家出的牌
	//	recv(client_fd[i])//
		//验证该玩家出的牌是否合法
		//把这张牌所对应的数发送个其他的玩家
	}
	
	return 0;
}