SDIR
ATF_REQUIRE((fd = open(SDIR, O_CREAT|O_RDWR, 0644)) != -1);
ATF_REQUIRE(mkdirat(-1, SDIR, mode) == -1);
ATF_REQUIRE(access(SDIR, F_OK) == 0);
ATF_REQUIRE(mkdirat(AT_FDCWD, SDIR, mode) != -1);
ATF_REQUIRE(access(SDIR, F_OK) == 0);