linux（armlinux）下UDP協議實現IP多播代碼

/****************************************************
*   功能：   linux  arm-linux  UPD多播       *
*   時間：   2006-03-07               *
*   撰寫：   李亞楠                 * 
*****************************************************/
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int port = 6789;                       //通訊連接埠
int main(void)
 {
 int    socket_descriptor;
 struct sockaddr_in address;
  socket_descriptor = socket(AF_INET, SOCK_DGRAM, 0);
  if (socket_descriptor == -1)
  {
     perror("Opening socket");
     exit(EXIT_FAILURE);
  }
  memset(&address, 0, sizeof(struct sockaddr_in));
  address.sin_family = AF_INET;
  address.sin_addr.s_addr = inet_addr("233.0.0.1");
  address.sin_port = htons(port);
  while(1)
 {
    if(sendto(socket_descriptor, "test from broadcast", sizeof("test from broadcast"), 0, (struct sockaddr *)&address, sizeof(address)) < 0)
    {
     printf("sendto/n");
     exit(EXIT_FAILURE);
    }
    sleep(2);
    }
   exit(EXIT_SUCCESS);
}