gistfile1.c

int
statd_get_socket(void)
{
        struct sockaddr_in      sin;
        struct servent *se;
        const int loopcnt = 100;
        int i, tmp_sockets[loopcnt];

        if (sockfd >= 0)
                return sockfd;

        for (i = 0; i < loopcnt; ++i) {

                if ((sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
                        xlog(L_ERROR, "%s: Can't create socket: %m", __func__);
                        break;
                }

                memset(&sin, 0, sizeof(sin));
                sin.sin_family = AF_INET;
                sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

                if (bindresvport(sockfd, &sin) < 0) {
                        xlog(D_GENERAL, "%s: can't bind to reserved port",
                                        __func__);
                        break;
                }
                se = getservbyport(sin.sin_port, "udp");
                if (se == NULL)
                        break;
                /* rather not use that port, try again */
                printf("DEBUG: skipping port %i, (%i/%s)\n", sin.sin_port, se->s_port, se->s_name);

                tmp_sockets[i] = sockfd;
        }

        while (--i >= 0)
                close(tmp_sockets[i]);

        if (sockfd < 0)
                return -1;

        FD_SET(sockfd, &SVC_FDSET);
        printf("DEBUG: socket is %i\n", sockfd);
        exit(1);
        return sockfd;
}