build_rcv_fd
build_rcv_fd(AF_INET, proto, rcv_fds, 2, NULL);
build_rcv_fd(AF_INET6, proto, rcv_fds + 2, 2, NULL);
build_rcv_fd(fam_rcv, proto, rcv_fds + 4, 1, addr_str);
build_rcv_fd(AF_INET, proto, rcv_fds + 5, 2, NULL);
build_rcv_fd(AF_INET6, proto, rcv_fds + 7, 2, NULL);
build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 5);
build_rcv_fd(AF_INET6, SOCK_DGRAM, &(rcv_fds[5]), 5);
build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds, 5);
build_rcv_fd(AF_INET, SOCK_DGRAM, &(rcv_fds[5]), 5);
build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 16);
build_rcv_fd(AF_INET6, SOCK_DGRAM, &(rcv_fds[16]), 16);
build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds, 16);
build_rcv_fd(AF_INET, SOCK_DGRAM, &(rcv_fds[16]), 16);
build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 5);
build_rcv_fd(AF_INET6, SOCK_STREAM, &(rcv_fds[5]), 5);
build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds, 5);
build_rcv_fd(AF_INET, SOCK_STREAM, &(rcv_fds[5]), 5);
build_rcv_fd(family, SOCK_STREAM, rcv_fds);