server.c

linux 下的服务端和客户端连接

#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <netinet/in.h>
#define  PORT 3333
#define  BACKLOG 10
#define  MAX_CONNECTED_NO 10
#define  MAXDATASIZE 15

main()
{
  struct sockaddr_in addr,client_addr;
  int sin_size,recvbytes;
  int sockfd,client_fd;
  char buf[MAXDATASIZE];
  if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){
    perror("socket");
    exit(1);
  }
  printf("socket success!,sockfd=%d\n",sockfd);

  addr.sin_family=AF_INET;
  addr.sin_port=htons(PORT);
  addr.sin_addr.s_addr=INADDR_ANY;
  bzero(&(addr.sin_zero),8);

  if(bind(sockfd,(struct sockaddr *)&addr,sizeof(struct sockaddr))==-1)
{
  perror("bind");
  exit(1);  
  }
  printf("bind success!\n");

   if(listen(sockfd,BACKLOG)==-1)
{
  perror("listen");
  exit(1);  
  }
  printf("listening.......\n");
  
   if((client_fd=accept(sockfd,(struct sockaddr *)&client_addr,&sin_size))==-1)
{
  perror("accept");
  exit(1);  
  }

   if((recvbytes=recv(client_fd,buf,MAXDATASIZE,0))==-1)
{
  perror("recv");
  exit(1);  
  }

  printf("received a connection:%s\n",buf);
  
  close(sockfd);

}