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标题: 求助：多播返回设置正常而多播组加入错误 [打印本页]

作者: zu_xf 时间: 2006-05-23 10:50
标题: 求助：多播返回设置正常而多播组加入错误
我用的2.4.25内核，已经使能了IP:multicasting选项。
IP_ADD_MEMBERSHIP多播组加入报错，No such device。
下面是socket创建函数：
int udpSocket(unsigned short int port_no,unsigned long net_ip)
{
int local_socket,optval,fd_status,mc_loop;
struct sockaddr_in addr;
struct ip_mreq mc_request;

if((local_socket = socket(AF_INET,SOCK_DGRAM,0)) < 0)
{
      printf("udp socket create error,port no is %d\n",(int)port_no);
      return -1;
}

/* 调用bind之前，设置套接口选项启用多播IP支持*/
mc_loop = 1;
if(setsockopt(local_socket,SOL_SOCKET, SO_REUSEADDR,&mc_loop, sizeof(mc_ loop)) < 0)
{
perror("setsockopt:SO_REUSEADDR");
exit(EXIT_FAILURE);
}

bzero((char *)&addr,sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(net_ip);
addr.sin_port = htons(port_no);

if(bind(local_socket,(struct sockaddr *)&addr,sizeof(addr)) < 0)
{
      close(local_socket);
      printf("udp socket bind error,port no is %d\n",(int)port_no);
      return -1;
}

fd_status = fcntl(local_socket,F_GETFL,0);
fcntl(local_socket,F_SETFL,fd_status|O_NONBLOCK);

mc_loop = 1;
if(setsockopt(local_socket,IPPROTO_IP, IP_MULTICAST_LOOP,&mc_loop, sizeof(mc_loop)) < 0)
{
perror("setsockopt:IP_MULTICAST_LOOP");
exit(EXIT_FAILURE);
}

mc_request.imr_multiaddr.s_addr = inet_addr("239.255.255.1");
mc_request.imr_interface.s_addr = htonl(INADDR_ANY);
int ret=0;
if ((ret=setsockopt(local_socket, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mc_request, sizeof(mc_request))) < 0)
{
perror("setsockopt:IP_ADD_MEMBERSHIP");
printf("IP_ADD_MEMBERSHIP:%d\n",ret);

               /*在此处报错No such device*/

exit(EXIT_FAILURE);
}
*sock_addr = addr;
return local_socket;
}

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