}

func mustHaveDisasm(t *testing.T) {
	switch runtime.GOARCH {
	case "loong64":
		t.Skipf("skipping on %s", runtime.GOARCH)
	case "mips", "mipsle", "mips64", "mips64le":
		t.Skipf("skipping on %s, issue 12559", runtime.GOARCH)
	case "riscv64":
		t.Skipf("skipping on %s, issue 36738", runtime.GOARCH)
	case "s390x":
		t.Skipf("skipping on %s, issue 15255", runtime.GOARCH)
	}
}

	if err := testenv.Command(t, "xcrun", "--help").Run(); err != nil {
		t.Skipf("error running xcrun, required for iOS cross build: %v", err)
	}
	// Check to see if the ios tools are installed. It's possible to have the command line tools
	// installed without the iOS sdk.
	if output, err := testenv.Command(t, "xcodebuild", "-showsdks").CombinedOutput(); err != nil {
		t.Skipf("error running xcodebuild, required for iOS cross build: %v", err)

		t.goTest.Skipf("Skipping %q: number of clusters %d is above required max %d",
			t.goTest.Name(), len(t.s.Environment().Clusters()), t.requiredMaxClusters)
		return
	}

	if t.minKubernetesMinorVersion > 0 {
		for _, c := range ctx.Clusters() {
			if !c.MinKubeVersion(t.minKubernetesMinorVersion) {
				t.goTest.Skipf("Skipping %q: cluster %s is below required min k8s version 1.%d",

	if errno != 0 {
		t.Skipf("could not create memory mapping: %s", errno)
	}
	syscall.Syscall(syscall.SYS_MUNMAP, base, 3<<30, 0)

	for off := uintptr(0); off < 3<<30; off += 65536 {
		_, _, errno := syscall.Syscall6(syscall.SYS_MMAP,
			base+off, 65536, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED|syscall.MAP_FIXED, tmp.Fd(), 0)
		if errno != 0 {

		t.Skipf("unable to set permissions on %q, likely no passwordless sudo/su: %s", filepath.Dir(bin), err)
	}

	if err := privesc("chown", user, bin); err != nil {
		t.Skipf("unable to set permissions on test binary, likely no passwordless sudo/su: %s", err)
	}
	if err := privesc("chmod", "u+s", bin); err != nil {

		mx, err := r.LookupMX(context.Background(), server)
		if err != nil {
			t.Fatal(err)
		}
		if len(mx) == 0 {
			t.Fatal("no results")
		}
		expected, err := nslookupMX(server)
		if err != nil {
			t.Skipf("skipping failed nslookup %s test: %s", server, err)
		}
		byPrefAndHost := func(a, b *MX) int {
			if r := cmp.Compare(a.Pref, b.Pref); r != 0 {
				return r
			}
			return strings.Compare(a.Host, b.Host)
		}

func TestFmaHash(t *testing.T) {
	switch runtime.GOOS {
	case "linux", "darwin":
	default:
		t.Skipf("Slow test, usually avoid it, os=%s not linux or darwin", runtime.GOOS)
	}
	switch runtime.GOARCH {
	case "amd64", "arm64":
	default:
		t.Skipf("Slow test, usually avoid it, arch=%s not amd64 or arm64", runtime.GOARCH)
	}

	testenv.MustHaveGoBuild(t)
	gocmd := testenv.GoToolPath(t)

	err := syscall.Mount("tmpfs", tmp, "tmpfs", 0, "")
	if testenv.SyscallIsNotSupported(err) {
		// Usually this means lack of CAP_SYS_ADMIN, but there might be
		// other reasons, especially in restricted test environments.
		t.Skipf("requires ability to mount tmpfs (%v)", err)
	} else if err != nil {
		t.Fatalf("mount %s failed: %v", tmp, err)
	}
	t.Cleanup(func() {
		if err := syscall.Unmount(tmp, 0); err != nil {
			t.Error(err)
		}
	})

	switch runtime.GOOS {
	case "android", "plan9", "windows", "wasip1":
		t.Skipf("not supported on %s", runtime.GOOS)
	}
	filename := "/etc/services" // a nice big file

	fd, err := os.Open(filename)
	if err != nil {
		// The file is missing even on some Unix systems.
		t.Skipf("skipping because failed to open /etc/services: %v", err)
	}
	defer fd.Close()
	br := bufio.NewReader(fd)

	network string
}{
	{"tcp"},
	{"udp"},
	{"unix"},
	{"unixpacket"},
}

func TestFileConn(t *testing.T) {
	switch runtime.GOOS {
	case "plan9", "windows", "js", "wasip1":
		t.Skipf("not supported on %s", runtime.GOOS)
	}

	for _, tt := range fileConnTests {
		if !testableNetwork(tt.network) {
			t.Logf("skipping %s test", tt.network)
			continue
		}

		var network, address string