rcv.c~

Linux下简单的网络通讯：发出接受数据（Socket）编程

#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/in.h>
//#define DEST_IP "192.168.0.83"
//#define DEST_IP "127.0.0.1"
#define MYPORT 4000
#define BACKLOG 10


main()
{
  int sockfd,new_fd;
  struct sockaddr_in my_addr,their_addr;
  int sin_size;
  int count=0;
  int result=0;

  char *msg="====================";
  int len,bytes_rcv;

  sockfd=socket(AF_INET,SOCK_STREAM,0);
   if (sockfd==-1) 
  {
    printf(" socket failed\n"); 
    exit(-1);
  }
  my_addr.sin_family=AF_INET;
  my_addr.sin_port=htons(MYPORT);
  my_addr.sin_addr.s_addr=INADDR_ANY;
  bzero(&(my_addr.sin_zero),8);

  result=bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr));
  while ((count<5)&&(result==-1))
    {
      printf(" can not bind\n");
      count++;
      result=bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr));
    
    }
  if (count==5) 
  {
    printf(" bind failed\n"); 
    exit(-1);
  }

  result=listen(sockfd,BACKLOG);
  while ((count<5)&&(result==-1))
    {
      printf(" can not listen\n");
      count++;
      result=listen(sockfd,BACKLOG);
          
    }
  if (count==5) 
  {
    printf(" listen failed\n"); 
    exit(-1);
  }

  sin_size=sizeof(struct sockaddr_in);
  new_fd=accept(sockfd,&their_addr,&sin_size);
   if (new_fd==-1) 
  {
    printf(" accept failed\n"); 
    exit(-1);
  } 
   close(sockfd);
  
  len=strlen(msg);
  bytes_rcv=recv(new_fd,msg,len,0);
  printf("receive success,msg=%s,length=%d\n",msg,bytes_rcv);
  close(new_fd);
}