多客戶網絡程序

 

/*multisevertcp.c*/
#include<stdlib.h>
#include<stdio.h>
#include<errno.h>
#include<string.h>
#include<netdb.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<sys/socket.h>
#include<signal.h>

#define portnumber 3333

int main()
{
 int server_sockfd,client_sockfd;
 int server_len,client_len;
 struct sockaddr_in server_address;
 struct sockaddr_in client_address;
 server_sockfd=socket(AF_INET,SOCK_STREAM,0);
 server_address.sin_family=AF_INET;
 server_address.sin_addr.s_addr=htonl(INADDR_ANY);
 server_address.sin_port=htons(portnumber);
 server_len=sizeof(server_address);
 bind(server_sockfd,(struct sockaddr *)&server_address,server_len);
 listen(server_sockfd,5);
 signal(SIGCHLD,SIG_IGN);
 while(1)
 {
  char ch;
  printf("server waiting\n");
  client_len=sizeof(client_address);
  client_sockfd=accept(server_sockfd,(struct sockaddr *)&client_address,&client_len);
  /*通過fork調用爲這個客戶創建一個子進程*/
  if(fork()==0)//子進程
  {
   read(client_sockfd,&ch,1);
   sleep(2);
   ch++;
   write(client_sockfd,&ch,1);
   close(client_sockfd);
   exit(0);
  }
  else //父進程
  {
   close(client_sockfd);
  }
 }
}