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Centos socket TCP代码

一、功能描述:

  能够在Centos中创建TCP socket,实现Client给Server发送消息,Server能够Client发送消息。

二、代码如下:

  ①client代码:

  #include <stdio.h>
  #include <string.h>
  #include <sys/socket.h>
  #include <netinet/in.h>
  #include <sys/types.h>


  int main()
  {
    int sockfd ;  //socket标示  
    struct sockaddr_in serverAddr;     //socket信息结构体

    serverAddr.sin_family = AF_INET;    //domain
    serverAddr.sin_port = htons(6666);   //server port    
    serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");   //server IP

    if((sockfd=socket(AF_INET,SOCK_STREAM,0))< 0){    //socket()
      printf("socket ERR!\n");
      return -1;
    }

    if( connect(sockfd, (struct sockaddr*)&serverAddr, sizeof(serverAddr))  == -1){    //connect()
      printf("connect error: (errno: )\n");
      return -1;
    }

    if(send(sockfd,"Sending string,logo_fox",strlen("Sending string,logo_fox"),0)<0){    //send()
      printf("send ERR!\n");
      return -1;
    }    close(sockfd);

    return -1;
  }

  ②server代码:

  #include <stdio.h>
  #include <sys/socket.h>
  #include <string.h>
  #include <netinet/in.h>
  #include <errno.h>

  int main(int argc ,char ** argv)
  {
    int sockfd, newfd;    //sockfd: socket标示  ,newfd:accept标示
    struct sockaddr_in serveraddr;    //socket信息结构体
    char buf[4096];    //数据缓存区
    int n;      //接收到的信息位数

    serveraddr.sin_family=AF_INET;     //socket domain

    serveraddr.sin_port = htons(6666);    //socket port
    serveraddr.sin_addr.s_addr=htonl(INADDR_ANY);    //socket IP info

    if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0){      //socket()
      printf("Socket ERR!\n");
      return -1;
    }

    if(bind(sockfd,(struct sockaddr *)&serveraddr,sizeof(serveraddr))<0){      //bind()
      printf("Bind ERR!%s(errno:%d)\n",strerror(errno),errno);
      return -1;
    }

    if(listen(sockfd,4)<0){      //listen()
      printf("Listen ERR!\n");
      return -1;
    }

    while(1){
      if((newfd=accept(sockfd,(struct sockaddr *)NULL,NULL))<0){        //accept()
        printf("accept ERR!\n");
        return -1;
      }

      n = recv(newfd,buf,4096,0);      //recv()
      printf("n:%d\n",n);

      buf[n]=‘\n‘;          //将接收到的信息变为字符串

      printf("recv msg from client is :%s\n",buf);

      close(newfd);      //关闭accept
    }

    close(sockfd);        //关闭Socket
  }

三、socket通讯流程

Centos socket TCP代码