Centos 64下实现socket通信

标签：socket   64位   linux   

    /* File Name: server.c */  
    #include<stdio.h>  
    #include<stdlib.h>  
    #include<string.h>  
    #include<errno.h>  
    #include<sys/types.h>  
    #include<sys/socket.h>  
    #include<netinet/in.h> //Ineternet address family 
    #include<arpa/inet.h>

    #define DEFAULT_PORT 8000  
    #define MAXLINE 4096  

    int main(int argc, char** argv)  
    {  
        int    socket_fd, connect_fd;  
        struct sockaddr_in     servaddr;  
        char    buff[4096];  
        int     n;  
        //初始化Socket  
        if( (socket_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1 ){  
        printf("create socket error: %s(errno: %d)\n",strerror(errno),errno);  
        exit(0);  
        }  
        //初始化  
        memset(&servaddr, 0, sizeof(servaddr));  
        servaddr.sin_family = AF_INET;  
        servaddr.sin_addr.s_addr = htonl(INADDR_ANY);//IP地址设置成INADDR_ANY,让系统自动获取本机的IP地址。  
        servaddr.sin_port = htons(DEFAULT_PORT);//设置的端口为DEFAULT_PORT  
      
        //将本地地址绑定到所创建的套接字上  
        if( bind(socket_fd, (struct sockaddr*)&servaddr, sizeof(servaddr)) == -1){  
        printf("bind socket error: %s(errno: %d)\n",strerror(errno),errno);  
        exit(0);  
        }  
        //开始监听是否有客户端连接  
        if( listen(socket_fd, 10) == -1){  
        printf("listen socket error: %s(errno: %d)\n",strerror(errno),errno);  
        exit(0);  
        }  
        printf("======waiting for client's request======\n");  
        while(1){  
		struct sockaddr_in cilent_addr;  //客户端socket地址结构
		socklen_t length = sizeof(cilent_addr);
    //阻塞直到有客户端连接，不然多浪费CPU资源。  
          if( (connect_fd = accept(socket_fd, (struct sockaddr*)&cilent_addr, &length)) == -1){ 
	 //客户端的socket地址结构会填写到cilent_addr结构体中
           printf("accept socket error: %s(errno: %d)",strerror(errno),errno);  
           continue;  
           }
		 
    //接受客户端传过来的数据  
        n = recv(connect_fd, buff, MAXLINE, 0);  
	if( n < 0 )
	{
		printf("Server Receive Data Faild!\n");
		break;
	}
        //向客户端发送回应数据  
        if(!fork()){ /*子进程*/
            if(send(connect_fd, "Hello,you are connected!\n", 26,0) == -1)  
            perror("send error");  
            close(connect_fd);  
            exit(0);  
            }  
        buff[n] = '\0';  
        printf("recv msg from client: %s\n", buff);  
	printf("has a cilent connect ip %s!\n", inet_ntoa(cilent_addr.sin_addr)); //打印出客户端地址信息
        close(connect_fd);  
        }  
        close(socket_fd);  
    }  

    /* File Name: client.c */  
      
    #include<stdio.h>  
    #include<stdlib.h>  
    #include<string.h>  
    #include<errno.h>  
    #include<sys/types.h>  
    #include<sys/socket.h>  
    #include<netinet/in.h>  
      
    #define MAXLINE 4096  
      
      
    int main(int argc, char** argv)  
    {  
        int     sockfd, n,rec_len;  
        char    recvline[4096], sendline[4096];  
        char    buf[MAXLINE];  
        struct sockaddr_in    servaddr;  
      
      
        if( argc != 2){  
        printf("usage: ./client <ipaddress>\n");  
        exit(0);  
        }  
      
      
        if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){  
        printf("create socket error: %s(errno: %d)\n", strerror(errno),errno);  
        exit(0);  
        }  
      
      
        memset(&servaddr, 0, sizeof(servaddr));  
        servaddr.sin_family = AF_INET;  
        servaddr.sin_port = htons(8000);  
        if( inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0){  
        printf("inet_pton error for %s\n",argv[1]);  
        exit(0);  
        }  
      
      
        if( connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0){  
        printf("connect error: %s(errno: %d)\n",strerror(errno),errno);  
        exit(0);  
        }  
      
      
        printf("send msg to server: \n");  
        fgets(sendline, 4096, stdin);  
        if( send(sockfd, sendline, strlen(sendline), 0) < 0)  
        {  
        printf("send msg error: %s(errno: %d)\n", strerror(errno), errno);  
        exit(0);  
        }  
        if((rec_len = recv(sockfd, buf, MAXLINE,0)) == -1) {  
           perror("recv error");  
           exit(1);  
        }  
        buf[rec_len]  = '\0';  
        printf("Received : %s ",buf);  
        close(sockfd);  
        exit(1);  
    }  

遇到到问题：

64位Centos下使用inet_ntoa()端错误：

Segmentation fault (core dumped)

解决方法：

1. 如果用inet_ntoa()的话需要#include <arpa/inet.h> ，就正常了。

2. 使用inet_ntop()

Centos 64下实现socket通信

标签：socket   64位   linux   

原文地址：http://blog.csdn.net/hanglinux/article/details/44961819