Sending Broadcast packets using UDP in Linux/C

sender.c:
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
 
 
#define PORT 2080
// #define SRC_ADDR "172.16.1.120"
#define DEST_ADDR "255.255.255.255"
 
int main(int argc, char *argv[])
{
        int sockfd;
        int broadcast=1;
        struct sockaddr_in sendaddr;
        struct sockaddr_in recvaddr;
        int numbytes;
 
        if((sockfd = socket(PF_INET,SOCK_DGRAM,0)) == -1)
        {
                perror("sockfd");
                exit(1);
        }
 
       if((setsockopt(sockfd,SOL_SOCKET,SO_BROADCAST,
                                &broadcast,sizeof broadcast)) == -1)
        {
                perror("setsockopt - SO_SOCKET ");
                exit(1);
        }
 
        sendaddr.sin_family = AF_INET;
        sendaddr.sin_port = htons(PORT);
        sendaddr.sin_addr.s_addr = INADDR_ANY;
        memset(sendaddr.sin_zero,'\0',sizeof sendaddr.sin_zero);
 
        if(bind(sockfd, (struct sockaddr*) &sendaddr, sizeof sendaddr) == -1)
        {
                perror("bind");
                exit(1);
        }
 
        recvaddr.sin_family = AF_INET;
        recvaddr.sin_port = htons(PORT);
        recvaddr.sin_addr.s_addr = inet_addr(DEST_ADDR);
        memset(recvaddr.sin_zero,'\0',sizeof recvaddr.sin_zero);
 
        while((numbytes = sendto(sockfd, "abcd", 4 , 0,
        (struct sockaddr *)&recvaddr, sizeof recvaddr)) != -1)
   {
                printf("Sent a packet");
                sleep(1000);
   }
        perror("sendto");
        exit(1);
 
 
        close(sockfd);
 
        return 0;
}
 
receiver.c:
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <netinet/in.h>
 
#define PORT 2080
#define DEST_ADDR "255.255.255.255" //broadcast addr
 
int main(int argc, char *argv[])
{
        int sockfd;
        char buf[10];
        struct sockaddr_in sendaddr;
        struct sockaddr_in recvaddr;
        int numbytes;
        int addr_len;
        int broadcast=1;
 
        if((sockfd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
        {
                perror("socket");
                exit(1);
        }
       if((setsockopt(sockfd,SOL_SOCKET,SO_BROADCAST,
                                &broadcast,sizeof broadcast)) == -1)
        {
                perror("setsockopt - SO_SOCKET ");
                exit(1);
        }
 
        printf("Socket created\n");
 
        sendaddr.sin_family = AF_INET;
        sendaddr.sin_port = htons(PORT);
        sendaddr.sin_addr.s_addr = INADDR_ANY;
        memset(sendaddr.sin_zero,'\0', sizeof sendaddr.sin_zero);
 
 
        recvaddr.sin_family = AF_INET;
        recvaddr.sin_port = htons(PORT);
        recvaddr.sin_addr.s_addr = INADDR_ANY;
        memset(recvaddr.sin_zero,'\0',sizeof recvaddr.sin_zero);
        if(bind(sockfd, (struct sockaddr*) &recvaddr, sizeof recvaddr) == -1)
        {
                perror("bind");
                exit(1);
        }
 
 
        addr_len = sizeof sendaddr;
        if ((numbytes = recvfrom(sockfd, buf, sizeof buf, 0,
              (struct sockaddr *)&sendaddr, (socklen_t *)&addr_len)) == -1)
        {
        perror("recvfrom");
      exit(1);
   }
 
        printf("%s",buf);
 
        return 0;
}
                                              

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