multicast_sender.c

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <time.h>
#include <string.h>
#include <stdio.h>


#define HELLO_PORT 12345
#define HELLO_GROUP "225.0.0.37"

main(int argc, char *argv[])
{
     struct sockaddr_in addr;
     int fd, cnt;
     struct ip_mreq mreq;
     char message[]="Hello, EMC";

     /* create what looks like an ordinary UDP socket */
     if ((fd=socket(AF_INET,SOCK_DGRAM,0)) < 0) {
    perror("socket");
    exit(1);
     }

     /* set up destination address */
     memset(&addr,0,sizeof(addr));
     addr.sin_family=AF_INET;
     addr.sin_addr.s_addr=inet_addr(HELLO_GROUP);
     addr.sin_port=htons(HELLO_PORT);
     
     /* now just sendto() our destination! */
     while (1) {
    if (sendto(fd,message,sizeof(message),0,(struct sockaddr *) &addr,
         sizeof(addr)) < 0) {
         perror("sendto");
         exit(1);
    }
    sleep(1);
     }
}