客户端代码，和一般的客户端不一样

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#define MAXDATASIZE 100

int main()

{

int sockfd,nbytes,serv_port;

char buf_serv_ip[16],buf[260];

struct sockaddr_in serv_addr;

if((sockfd=socket(/*AF_INET,SOCK_STREAM,0*/PF_INET, SOCK_STREAM, IPPROTO_TCP))==-1){

perror("创建套接字失败!\n");

exit(1);

}

//创建套接字成功后设置其可重用的属性

int KeepAlive=1;

socklen_t KPlen=sizeof(int);

if(setsockopt(sockfd,SOL_SOCKET,SO_KEEPALIVE,(char *)&KeepAlive,KPlen)!=0){

perror("设置周期测试连接是否仍存活失败!\n");

exit(1);

}

int keepIdle = 10;//每次检测的相隔时间

int keepInterval = 1;//检测前的空间时间

int keepCount = 3;//最大检测次数

setsockopt(sockfd,SOL_TCP,TCP_KEEPINTVL,(void *)&keepIdle,sizeof(keepIdle));

setsockopt(sockfd,SOL_TCP,TCP_KEEPIDLE,(void *)&keepInterval,sizeof(keepInterval));

setsockopt(sockfd,SOL_TCP,TCP_KEEPCNT,(void *)&keepCount,sizeof(keepCount));

printf("请输入要连接主机的IP地址：\n");

scanf("%s",buf_serv_ip);

printf("请输入要连接主机的端口号:\n");

scanf("%d",&serv_port);

serv_addr.sin_family=AF_INET;

serv_addr.sin_addr.s_addr=inet_addr(buf_serv_ip);

serv_addr.sin_port=htons(serv_port);

bzero(&(serv_addr.sin_zero),8);

if(connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(struct sockaddr))==-1){

perror("连接服务器失败!\n");

exit(1);

}

if((getsockopt(sockfd,SOL_SOCKET,SO_KEEPALIVE,(char*)&KeepAlive,&KPlen))==0){

printf("SO_KEEPALIVE Value: %d\n", KeepAlive);

}

printf("连接服务器成功!\n");

//在此处可以先接受判断将要接受数据的长度再创建数组

int i =0;

int res = 0;

int errcode;

fd_set readmask;

struct timeval timeout;

while(1){

FD_ZERO(&readmask);

FD_SET(sockfd, &readmask);

timeout.tv_sec = 1;

timeout.tv_usec = 0;

if ((res = select(sockfd + 1, &readmask, NULL, NULL, &timeout)) < 0)

{

printf("the socket is error\n");

exit(1);

}

printf("select return %d\n", res);

if(res == 0)

{//检测连接是否超时，可能服务器长时间没发数据

int sockfdtemp;

errno = 0;

printf("连接超时\n");

/*

if((sockfdtemp=socket(AF_INET,SOCK_STREAM,0))==-1){

perror("超时接字失败!\n");

exit(1);

}

if(connect(sockfdtemp,(struct sockaddr *)&serv_addr,sizeof(struct sockaddr))==-1){

printf("超时连接服务器失败!\n");

errcode = errno;u

//close(sockfdtemp);

if (errcode != ENOENT && errcode != ECONNREFUSED) {

printf("Failed to establish connection: %d\n", errcode);

}

//continue;

//exit(1);

}else

{

printf("服务器没挂!\n");

//close(sockfdtemp);

}

close(sockfdtemp);

*/

continue;

}

/* 处理Slave端连接请求 */

if( (sockfd != -1 ) && FD_ISSET(sockfd, &readmask) )

{

printf("the socket is ok\n");

memset(buf, 0, 260);

errno = 0;

if((nbytes=recv(sockfd,buf,260,0))==-1){

printf("接受数据失败!\n");

errcode = errno;

if(errcode == ETIMEDOUT)

{//服务器真正的挂掉

printf("******服务器挂掉 %d : %d \n", errno, ETIMEDOUT);

exit(1);

}

}

if (nbytes == 0)

{

printf("数据为空： %d\n", i);

}

else

{

buf[nbytes]='\0';

printf("接受的数据为:%d\n", i);

}

}else

{

printf("the socket is not OK\n");

exit(1);

}

i++;

}

close(sockfd);

return 0;

}