server.c

cs89000的驱动编写。很有助于新手学习。本人看了以后觉得受益非浅。在此与大家分享。希望有帮助。

#include <stdio.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <time.h>

#define SERVER_PORT 12345 // define the defualt connect port id
#define LENGTH_OF_LISTEN_QUEUE 10 //length of listen queue in server
#define BUFFER_SIZE 255
#define WELCOME_MESSAGE "welcome to connect the server. "

int main(int argc, char **argv)
{
     printf("The beginning of main function.\n");
       int servfd,clifd;
       struct sockaddr_in servaddr,cliaddr;

       if ((servfd = socket(AF_INET,SOCK_STREAM,0)) < 0)
       {
              printf("create socket error!\n");
              exit(1);
       }

       bzero(&servaddr,sizeof(servaddr));

       servaddr.sin_family = AF_INET;
       servaddr.sin_port = htons(SERVER_PORT);
       servaddr.sin_addr.s_addr = htons(INADDR_ANY);

       if (bind(servfd,(struct sockaddr*)&servaddr,sizeof(servaddr))<0)
       {
              printf("bind to port %d failure!\n",SERVER_PORT);
              exit(1);
       }
 
       if (listen(servfd,LENGTH_OF_LISTEN_QUEUE) < 0)
       {
              printf("call listen failure!\n");
              exit(1);
       }

       //server loop will nerver exit unless any body kill the process
	while(1){
		      printf("The beginning of the circle.\n");
              char buf[BUFFER_SIZE];
              long timestamp;
              socklen_t length = sizeof(cliaddr);
			  printf("before accept function .\n");
              clifd = accept(servfd,(struct sockaddr*)&cliaddr,&length);
			  printf("after accept function.\n");
              if (clifd < 0)
              {
                     printf("error comes when call accept!\n");
                     //break;
			return 1;
              }
              strcpy(buf,WELCOME_MESSAGE);
              //inet_ntop(INET_ADDRSTRLEN,cliaddr.sin_addr,buf,BUFFER_SIZE);
              printf("from client,IP:%s,Port:%d\n",inet_ntoa(cliaddr.sin_addr),ntohs(cliaddr.sin_port));
              timestamp = time(NULL);
              strcat(buf,"timestamp in server:");
              strcat(buf,ctime(&timestamp));
              send(clifd,buf,BUFFER_SIZE,0);
              close(clifd);           
	}
       close(servfd);
       return 0;
}