Advanced API Usage

A part of a sample application code

      if ((gf = malloc(GROUP_FILTER_SIZE(numsrc))) == NULL)
            perror("memory allocation error");

      bzero(gf, GROUP_FILTER_SIZE(numsrc));
      gf->gf_interface = index;
      gf->gf_fmode = mode;
      gf->gf_numsrc = numsrc;
      bcopy(&grp, &gf->gf_group, grp.sin6_len);
      for (i = 0; i < numsrc; i++)
            bcopy(&src[i], &gf->gf_slist[i], src[i].sin6_len);

      if (ioctl(socket, SIOCSMSFILTER, gf) != 0)
            perror("cannot listen group");