Linux下socket编程示范（一个服务…

socket编程的基础函数使用请自查询，本文只给出在linuxgcc可编译运行的socket通信的服务器程序与客户端程序。
代码如下：server端



#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include<signal.h>            //signal
#include<sys/socket.h>         //socket
#include <netinet/in.h>      //sockaddr_in
#include <arpa/inet.h>
#include<string.h>            //memset
const int BUFF_SIZE=10;
void process(int client_fd,int cmd)
{
   switch(cmd)
    {
    case0:
       printf("reccmd 0");break;
    case1:
   default:
      printf("default %d\n",cmd);break;
    }
   send(client_fd,"OK",BUFF_SIZE,0);
}
int main(void) {
    intserver_fd,client_fd;   //socket fd
    structsockaddr_in my_addr;  //服务器网络地址结构体
    structsockaddr_in remote_addr; //客户端网络地址结构体
    intcmd;
    charstr[10];
    pid_tpid;
    unsigned intlen;
//1.init
   memset(&my_addr,0,sizeof(my_addr));//数据初始化--清零
   my_addr.sin_family=AF_INET;      //设置为IP通信
   my_addr.sin_addr.s_addr=INADDR_ANY;//服务器IP地址--允许连接到所有本地地址上
   my_addr.sin_port=htons(8000);      //服务器端口号
//2.socket
    if((server_fd = socket(AF_INET,SOCK_STREAM,0)) <0)//create socket;
    {
      perror("socket create failed");
      exit(-1);
    }
//3.bind
    if(bind(server_fd,(struct sockaddr*)&my_addr,sizeof(structsockaddr))<0)
    {
       perror("bindfailed");
       return1;
    }
//4.listen
   listen(server_fd,5);
    puts("Nowserver begin listening ,the listen queue len is5");


   signal(SIGCLD,SIG_IGN);    //ignore tehdetail of the child process exit

    intclient_len = sizeof(remote_addr);
   while(1){
//5.accept
      if((client_fd=accept(server_fd,(struct sockaddr*)&remote_addr,&client_len))<0)
          {
             perror("accept");
             return 1;
          }
       if( (pid =fork())== 0)         //child
       {
   //       client_fd=accept(server_fd,(structsockaddr*)&remote_addr,&client_len);
   //       puts("aclient connected");
//6.receive
         printf("working for %s\n",inet_ntoa(remote_addr.sin_addr));
          len =send(client_fd,"welcome!",BUFF_SIZE,0);
          puts("sendwelcome!");
          len =recv(client_fd,&cmd,sizeof(cmd),0);
         process(client_fd,cmd);
         close(client_fd);
         exit(0);
       }
      if(pid)               //parent
       {
          puts("Inparent process");
         close(client_fd);
      //   puts("parent process over");
         sleep(1);
       }
    }
   close(server_fd);
    returnEXIT_SUCCESS;
}



#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include<signal.h>            //signal
#include<sys/socket.h>         //socket
#include <netinet/in.h>      //sockaddr_in
#include <arpa/inet.h>
#include<string.h>            //memset
const int BUFF_SIZE=10;
int main(void) {
       intclient_sockfd;
       intlen,cmd;
       structsockaddr_in remote_addr; //服务器端网络地址结构体
       charbuf[BUFF_SIZE];  //数据传送的缓冲区
      memset(&remote_addr,0,sizeof(remote_addr));//数据初始化--清零
      remote_addr.sin_family=AF_INET; //设置为IP通信
      remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");//服务器IP地址
      remote_addr.sin_port=htons(8000); //服务器端口号

      
      if((client_sockfd=socket(PF_INET,SOCK_STREAM,0))<0)
       {
          perror("socket");
          return 1;
       }

      
      if(connect(client_sockfd,(struct sockaddr*)&remote_addr,sizeof(structsockaddr))<0)
       {
          perror("connect");
          return 1;
       }
      printf("connected to server\n");
      len=recv(client_sockfd,buf,BUFSIZ,0);//接收服务器端信息
           buf[len]='/0';
      printf("received %s\n",buf); //打印服务器端信息

      
       puts("pleaseinput cmd");
      scanf("%d",&cmd);
          len=send(client_sockfd,&cmd,4,0);
          len=recv(client_sockfd,buf,BUFF_SIZE,0);
          buf[len]='/0';
            printf("received %s\n",buf); //打印服务器端信息

      close(client_sockfd);//关闭套接字
       return0;
}