天河超算，计算节点和服务节点之间进行socket通信

1）ping cn5071

PING cn5071 (12.0.157.39) 56(84) bytes of data.

64 bytes from cn5071 (12.0.157.39): icmp_seq=1 ttl=64 time=0.086 ms

64 bytes from cn5071 (12.0.157.39): icmp_seq=2 ttl=64 time=0.073 ms

64 bytes from cn5071 (12.0.157.39): icmp_seq=3 ttl=64 time=0.084 ms

^C

--- cn5071 ping statistics ---

3 packets transmitted, 3 received, 0% packet loss, time 2014ms

rtt min/avg/max/mdev = 0.073/0.081/0.086/0.005 ms

2）客户端程序

#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h> //exit
#include <string.h> //bzero
#include <strings.h> //strncasecmp 忽略大小写比较
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
 
#define SERV_PORT (5001)
#define SERV_IP   "12.0.157.39" //只能用ifconfig查到的
#define BUFSIZE   (128)
#define QUIT_STR  "quit"
 
int main(void)
{
    int sock_fd;
    struct sockaddr_in cin;
    char wr_buf[BUFSIZE];
 
    //1.创建
    sock_fd = socket(AF_INET,SOCK_STREAM,0);
    if(sock_fd == -1)
    {
        perror("socket");
        exit(1);
    }
    //2.连接服务器,还是一样先配置sockaddr_in
    bzero(&cin,sizeof(cin));
    cin.sin_family = AF_INET;
    cin.sin_port   = htons(SERV_PORT);
    cin.sin_addr.s_addr = inet_addr(SERV_IP); 
    if( inet_pton(AF_INET,SERV_IP,(void*)&cin.sin_addr) != 1 )
    {
        perror("inet_pton");
        exit(1);
    }
    if( connect(sock_fd,(struct sockaddr*)&cin,sizeof(cin)) == -1 )
    {
        perror("connect");
        exit(1);
    }
 
    //3.写数据
    while(1)
    {
        bzero(wr_buf,BUFSIZE);//写之前先清零
        if( fgets(wr_buf,BUFSIZE-1,stdin) == NULL)
        {
            continue;//重新获取
        }
        write(sock_fd,wr_buf,strlen(wr_buf));//写数据--相当于发送给服务器
 
        if( strncasecmp(wr_buf,QUIT_STR,strlen(QUIT_STR)) == 0) //输入了quit
        {
            break;
        } 
    }
 
    close(sock_fd);
    return 0;
}

2）服务器程序

#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h> //exit
#include <string.h> //bzero
#include <strings.h> //strncasecmp 忽略大小写比较
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
 
#define SERV_PORT (5001)
#define SERV_IP   "12.0.157.39"
#define BUFSIZE   (128)
#define QUIT_STR  "quit"
 
int main(void)
{
    int sock_fd,newfd;
    struct sockaddr_in sin;
    char rd_buf[BUFSIZE];
    int read_num;
 
	//1.创建
    if( (sock_fd = socket(AF_INET,SOCK_STREAM,0)) == -1 )
    {
        perror("socket");
        exit(1);
    }
	//2.绑定 需要先配置sockaddr_in
    bzero(&sin,sizeof(sin));//清零再填充 
    sin.sin_family = AF_INET;//IPV4
    sin.sin_port   = htons(SERV_PORT);//端口号转换网络字节序
    //两种IP地址转换
    //sin.sin_addr.s_addr = inet_addr(SERV_IP);
    if( inet_pton(AF_INET,SERV_IP,(void*)&sin.sin_addr) != 1 ) 
    {
        perror("inet_pton");
        exit(1);
    }
    if(bind(sock_fd,(struct sockaddr*)&sin,sizeof(sin)) == -1)
    {
        perror("bind");
        exit(1);
    }
    //3.监听
    if( listen(sock_fd,5) == -1 )
    {
        perror("listen");
        exit(1);
    }
    //4.阻塞等待客户端连接 连接成功后需要newfd
    if( (newfd = accept(sock_fd,NULL,NULL)) == -1 )
    {
        perror("accept");
        exit(1);
    }
	while(1)
    {
        bzero(rd_buf,BUFSIZE); //读之前先请零
        do
        {
            read_num = read(newfd,rd_buf,BUFSIZE-1);
        }while(read_num < 0 && errno == EINTR);
        if(read_num < 0)
        {
            perror("read");
        }
        if(read_num == 0) //客户端关闭
        {
            printf("Client is closed!\n");
            break;
        }
        printf("Server received:%s\n",rd_buf);
        if( strncasecmp(rd_buf,QUIT_STR,strlen(rd_buf)) == 0)//客户端输入quit
        {
            printf("Client is exiting!\n");
            break;
        }
    }
    close(newfd);
    close(sock_fd);
 
    return 0;
}

4）

编译程序

g++ server.cpp -o o1.server

g++ client.cpp -o o2.client

5）运行效果

client端

./o2.client

123

456

quit

server端

yhrun -p thcp1 -w cn5071 o1.server

Server received:123

Server received:456

Server received:quit

Client is closed!

6）在天河上是支持计算节点与服务器之间的socket通信的