ss.cpp

linux socket编程服务端例子

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>

#include   <netinet/in.h>
#include   <arpa/inet.h>

#define SERVPORT 3333/*服务器监听端口号 */
#define BACKLOG 10/* 最大同时连接请求数 */

main()
{
   int sockfd,client_fd;/*sock_fd：监听socket；client_fd：数据传输socket */
   struct sockaddr_in my_addr;/* 本机地址信息 */
   struct sockaddr_in remote_addr;/* 客户端地址信息 */
   if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
   {
      perror("socket创建出错！"); exit(1);
   }
  
   my_addr.sin_family=AF_INET;
   my_addr.sin_port=htons(SERVPORT);
   my_addr.sin_addr.s_addr = INADDR_ANY;
   bzero(&(my_addr.sin_zero),8);
   if(bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1)
   { 
     perror("bind出错！");
     exit(1);
   }
   
   if (listen(sockfd, BACKLOG) == -1)
   {
     perror("listen出错！");
     exit(1);
   }
   
   if(fork() > 0)
   { 
       printf("begin.....\n");
       return 0;
   }
   
   while(1)
   {
     unsigned int sin_size = sizeof(struct sockaddr_in);
     if((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1)
     {
       perror("accept出错");
       continue;
     }
    
     printf("received a connection from %s\r\n", inet_ntoa(remote_addr.sin_addr));

/*
     if (!fork())
     { 
     	//子进程代码段 
       if (send(client_fd, "Hello, you are connected!\r\n", 26, 0) == -1)
       {
         perror("send出错！");
       }
         
       close(client_fd);
       exit(0);
     } 
     */
    
     close(client_fd);
   } 
}