option

getopt()を使用するが、マルチモジュールの場合はgetopt_long()を使うらしい？

以下、lagopusのparse_argsの例

static void
parse_args(int argc, const char *const argv[]) {
  int o;

  /*
   * FIXME:
   *    Avoid to use getopt() for proper multi-modules initialization.
   */
  while ((o = getopt_long(argc, (char * const *)argv,
                          "dh?vl:p:C:", s_longopts, NULL)) != EOF) {
    switch (o) {
      case 0: {
        break;
      }
      case 'd': {
        s_debug_level++;
        break;
      }
      case 'h':
      case '?': {
        usage(stdout, 0);
        break;
      }
      case 'v': {
        fprintf(stdout, "%s version %d.%d.%d%s\n",
                LAGOPUS_PRODUCT_NAME,
                LAGOPUS_VERSION_MAJOR,
                LAGOPUS_VERSION_MINOR,
                LAGOPUS_VERSION_PATCH,
                LAGOPUS_VERSION_RELEASE);
        exit(0);
        /* NOTREACHED */
      }
      case 'l': {
        s_logfile = optarg;
        break;
      }
      case 'p': {
        s_pidfile = optarg;
        break;
      }
      case 'C': {
        s_configfile = optarg;
        break;
      }
      default: {
        usage(stderr, 1);
        break;
      }
    }
  }
}