register_group
static void register_group(char **g, int is_volatile);
register_group(group1, 0);
register_group(group2, 0);
register_group(group3, 0);
register_group(group4, 0);
register_group(volgroup1, 1);
register_group(volgroup2, 1);
register_group(volgroup3, 1);
register_group(volgroup4, 1);
register_group(volgroup5, 1);