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电梯直达

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发表于 2015-06-15 16:23 |只看该作者 |倒序浏览

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

#define SERV_PORT 3000

int main()
{
  int sock_fd;  //套接字描述符号
  int recv_num;
  int send_num;
  int client_len;
  char recv_buf[20];
  struct sockaddr_in addr_serv;
  struct sockaddr_in addr_client;  //服务器和客户端地址
  sock_fd=socket(AF_INET,SOCK_DGRAM,0);
  if(sock_fd<0)
  {
   perror("socket");
   exit(1);
  }
  else
  {
   printf("sock sucessful\n");
  }

  //初始化服务器端地址
  memset(&addr_serv,0,sizeof(struct sockaddr_in));
  addr_serv.sin_family=AF_INET;  //协议族
  addr_serv.sin_port=htons(SERV_PORT);
  addr_serv.sin_addr.s_addr=htonl(INADDR_ANY); //任意本地址
  client_len=sizeof(struct sockaddr_in);


  /*绑定套接字*/
  if(bind(sock_fd,(struct sockaddr *)&addr_serv,sizeof(struct sockaddr_in))<0)
  {
perror("bind");
exit(1);
  }
  else
  {
printf("bind sucess\n");
  }

  while(1)
  {
printf("begin recv:\n");
recv_num = recvfrom(sock_fd,recv_buf,sizeof(recv_buf),0,
                           (struct sockaddr *)&addr_client,&client_len) ;
if(recv_num < 0)
{
   printf("bad\n");
   perror("again recvfrom");
   exit(1);
}
else
{
   recv_buf[recv_num]='\0';
   printf("recv sucess:%s\n",recv_buf);
}

   printf("begin send:\n");
   send_num = sendto(sock_fd,recv_buf,recv_num,0,
   (struct sockaddr *)&addr_client,client_len);
if(send_num < 0)
{
   perror("sendto");
   exit(1);
}
else
{
   printf("send sucessful\n");
}
  }
  close(sock_fd);
  return 0;
}