return syscall.Setenv(key, value)
}

func Clearenv() {
	syscall.Clearenv()
}

func Environ() []string {
	return syscall.Environ()
}

func Unsetenv(key string) error {
	return syscall.Unsetenv(key)

		t.Fatal(err)
	}
	if got := runtime.GOROOT(); got != want {
		t.Errorf(`after setenv runtime.GOROOT()=%q, want %q`, got, want)
	}
	if err := syscall.Unsetenv("GOROOT"); err != nil {
		t.Fatal(err)
	}
	if got := runtime.GOROOT(); got != want {
		t.Errorf(`after unsetenv runtime.GOROOT()=%q, want %q`, got, want)
	}

	os.Setenv("FOO", "bar")
	s := C.GoString(C.getenv(C.CString("FOO")))
	if s != "bar" {
		panic("bad setenv, environment variable only has value \"" + s + "\"")
	}
	os.Unsetenv("FOO")
	s = C.GoString(C.getenv(C.CString("FOO")))
	if s != "" {
		panic("bad unsetenv, environment variable still has value \"" + s + "\"")
	}

	return syscall.Setenv(key, value)
}

func Clearenv() {
	syscall.Clearenv()
}

func Environ() []string {
	return syscall.Environ()
}

func Unsetenv(key string) error {
	return syscall.Unsetenv(key)

/* Stub for calling setenv */
void
x_cgo_setenv(char **arg)
{
	_cgo_tsan_acquire();
	setenv(arg[0], arg[1], 1);
	_cgo_tsan_release();
}

/* Stub for calling unsetenv */
void
x_cgo_unsetenv(char **arg)
{
	_cgo_tsan_acquire();
	unsetenv(arg[0]);
	_cgo_tsan_release();

		env = append(env, UTF16ToString(entry))
		block = (*uint16)(unsafe.Add(end, size))
	}
	return env, nil
}

func Unsetenv(key string) error {
	return syscall.Unsetenv(key)

	}
}

// setEnv sets cmd.Env so that key = value.
func setEnv(cmd *exec.Cmd, key, value string) {
	cmd.Env = append(cmd.Environ(), key+"="+value)
}

// unsetEnv sets cmd.Env so that key is not present in the environment.
func unsetEnv(cmd *exec.Cmd, key string) {
	cmd.Env = cmd.Environ()

	prefix := key + "="
	newEnv := []string{}
	for _, entry := range cmd.Env {
		if strings.HasPrefix(entry, prefix) {

	}
	if err := Setenv(testKey, "1"); err != nil {
		t.Fatalf("Setenv: %v", err)
	}
	if !set() {
		t.Error("Setenv didn't set TestUnsetenv")
	}
	if err := Unsetenv(testKey); err != nil {
		t.Fatalf("Unsetenv: %v", err)
	}
	if set() {
		t.Fatal("Unsetenv didn't clear TestUnsetenv")
	}
}

func TestClearenv(t *testing.T) {
	const testKey = "GO_TEST_CLEARENV"
	const testValue = "1"

	// reset env

	}
	keyp, err := UTF16PtrFromString(key)
	if err != nil {
		return err
	}
	e := SetEnvironmentVariable(keyp, v)
	if e != nil {
		return e
	}
	runtimeSetenv(key, value)
	return nil
}

func Unsetenv(key string) error {
	keyp, err := UTF16PtrFromString(key)
	if err != nil {
		return err
	}
	e := SetEnvironmentVariable(keyp, nil)
	if e != nil {
		return e
	}
	runtimeUnsetenv(key)
	return nil
}

func Setenv(key, value string) error {
	err := syscall.Setenv(key, value)
	if err != nil {
		return NewSyscallError("setenv", err)
	}
	return nil
}

// Unsetenv unsets a single environment variable.
func Unsetenv(key string) error {
	return syscall.Unsetenv(key)
}

// Clearenv deletes all environment variables.
func Clearenv() {
	syscall.Clearenv()
}