RESTRICTED_PARENT_UGID
ensure_user_exists(RESTRICTED_PARENT_UGID);
ensure_group_exists(RESTRICTED_PARENT_UGID);
if (setgid(RESTRICTED_PARENT_UGID) < 0)
die("Error with set gid(%d)\n", RESTRICTED_PARENT_UGID);
if (setuid(RESTRICTED_PARENT_UGID) < 0)
die("Error with set uid(%d)\n", RESTRICTED_PARENT_UGID);