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/*创建一个socket用于tcp通信*/
if((sockfd = socket(AF_INET,SOCK_STREAM,0)) < 0){
perror(”socket”);
exit(errno);
}
/*初始化服务器端(对方)的地址和端口信息*/
bzero(&dest,sizeof(dest));
dest.sin_family = AF_INET;
dest.sin_port = htons(atoi(argv[2]));
if(inet_aton(argv[1],(struct in_addr *)&dest.sin_addr.s_addr) == 0){
perror(argv[1]);
exit(errno);
}
/*conect to the server*/
if(connect(sockfd,(struct sockaddr*)&dest,sizeof(dest)) !=0){
perror(”connect”);
exit(errno);
}
printf(”\n—ready to chatting…—\n”);
while(1){
/*把集合清空*/
FD_ZERO(&rfds);
/*把标准输入句柄0加入到集合中*/
FD_SET(0,&rfds);
maxfd = 0;
/*把当前连接句柄socket 加入到集合中*/
FD_SET(sockfd,&rfds);
if(sockfd > maxfd)
maxfd = sockfd;
/*设置最大等待时间*/
tv.tv_sec = 1;
tv.tv_usec = 0;
/*开始等待*/
retval = select(maxfd+1,&rfds,NULL,NULL,&tv);
if(retval == -1){
printf(”select error,quit!\n”);
break;
}else if(retval == 0){
continue;
}else{
if(FD_ISSET(sockfd,&rfds)){
/*连接的socket 上有消息则接收并显示*/
bzero(buffer,MAXBUF+1);
/*接收对方发过来的消息,最多MAXBUF字节*/
len = recv(sockfd, buffer, MAXBUF, 0);
if(len > 0)
printf(”recv msg success:%s! %d bytes rcv.\n “,buffer,len);
else{
if(len < 0){
printf(”recv msg fail.the errno is:%d,error info is %s.\n”,errno,strerror(errno));
}
else
printf(”quit.\n”);
break;
}
}// FD_ISSET = sockfd情况
if(FD_ISSET(0,&rfds)){
/*用户有输入了,则读取其内容并发送*/
bzero(buffer, MAXBUF+1);
fgets(buffer, MAXBUF, stdin);
if(!strncasecmp(buffer, “quit”, 4)){
printf(”self request to quit the chating\n”);
break;
}
/*发消息给服务器*/
len = send(sockfd, buffer, strlen(buffer)-1 , 0);
if(len < 0){
printf(”mgs:%s send fail!errno is:%d,error info is:%s\n”, buffer, errno, strerror(errno));
break;
}else{
printf(”msg: %s\t send success, send %d bytes!\n”, buffer, len);
}
}//FD_ISSET = 0
}//select 处理结束
}//处理聊天的while 循环
/*关闭连接*/
close(sockfd);
return 0;
}
运行结果:
终端1:服务器端
[root@localhost net]# ./select_server 7838
—-waiting for new connecting to start new char—-
server:got connection from 172.31.100.236,port 59462,socked 4
recv msg success:kfldsjfk! 8 bytes rcv.
456354
msg: 456354
send success, send 6 bytes!
recv msg success:453455! 6 bytes rcv.
终端2:客户端
[root@localhost net]# ./select_client 172.31.100.236 7838
—ready to chatting…—
kfldsjfk
msg: kfldsjfk
send success, send 8 bytes!
recv msg success:456354! 6 bytes rcv.
453455
msg: 453455
send success, send 6 bytes!
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