How can I implement multi-cast socket connection using C programming -

there problem packets drops. doing socket connection udp packets, think there may problem in multi-cast socket connection. please me — code proper or not?

#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <arpa/inet.h> #include <sys/socket.h>  int main(int argc, char *argv[]) {     struct sockaddr_in si_me, si_other;     struct ip_mreq mreq;     socklen_t slen = sizeof(si_other);     int s = -1;     if ((s = socket(af_inet, sock_dgram, ipproto_udp)) == -1) {         printf("error creating socket\n");     }      int yes = 1;     if (setsockopt(s, sol_socket, so_reuseaddr, &yes, sizeof(int)) == -1) {        printf("setsockopt");exit(1);     }     int val = 1;     if (setsockopt(s, sol_socket, so_reuseport, (const char *) &val,         sizeof(val)) < 0) {     }      memset((char *) &si_me, 0, sizeof(si_me));     si_me.sin_family = af_inet;     si_me.sin_port = htons(42000);     si_me.sin_addr.s_addr = htonl(inaddr_any);      //bind socket port     if (bind(s, (struct sockaddr*) &si_me, sizeof(si_me)) == -1) {        printf("error binding port\n");     }      //multicast socket     mreq.imr_multiaddr.s_addr = inet_addr("232.0.1.1");     mreq.imr_interface.s_addr = htonl(inaddr_any);     if (setsockopt(s, ipproto_ip, ip_add_membership, &mreq, sizeof(mreq)) < 0) {     printf("setsockopt mreq");     exit(1);     }     int recv_len;     while(true) {         if ((recv_len = (int) recvfrom(s, data, buflen, 0,(struct sockaddr *) &si_other, &slen)) == -1) {          printf("error receiving pakcets\n");          }     } }