Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "socket.h"
#include "byte.h"
int socket_mcjoin4(int s,const char ip[4],const char interface[4])
{
struct ip_mreq opt;
byte_copy(&opt.imr_multiaddr.s_addr,4,ip);
byte_copy(&opt.imr_interface.s_addr,4,interface);
return setsockopt(s,IPPROTO_IP,IP_ADD_MEMBERSHIP,&opt,sizeof opt);
}