client.c

linux下采用UDP协议的套接字的收发报文例子,套接口编程练习。

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

int port = 5678;

int main(void)
{
  int socket_descripter,s_len;
  int on,i;
  char message[256];
  struct sockaddr_in s_addr;

s_len=sizeof(s_addr);

 socket_descripter=socket(AF_INET,SOCK_DGRAM,0);
 if(socket_descripter<0)
 {
   printf("socket created error\n");
   exit(0);
 }

/* Allow processes to use this same port:*/
    on=1;
if(setsockopt(socket_descripter,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on))<0)
    {
      printf("error in setsockopt:SO_REUSEADDR");
      exit(0);
    }

   memset(&s_addr, 0,sizeof(s_addr));
   s_addr.sin_family=AF_INET;
   s_addr.sin_port=htons(port);
   s_addr.sin_addr.s_addr=inet_addr("10.0.0.18");

  if(bind(socket_descripter,(struct sockaddr *)&s_addr,sizeof(s_addr))<0)
     {
     printf("error in binding\n");
     exit(0);
    }

for(i=0;i<5;i++)
   {
    if(recvfrom(socket_descripter, message, 256, 0, (struct sockaddr *)&s_addr, &s_len)<0)
     {
       printf("error in recvfrom!\n");
       exit(0);
    }
  else
    {
     printf("recv success\n");
     sleep(1);
    }
 }

}