System Properties based Cmake file that help you to import it to app project easily and config Kernel services and settings RealTime.
in this example, we Read the HDMI_IN status and enabled the audio route or disabled it for Kernel.
Test board :"FriendlyELEC rk3399-android-8.1"
#include <jni.h>
#include <cutils/properties.h>
extern "C" {
JNIEXPORT void JNICALL
Java_com_example_nouri_enableHdmiIn(JNIEnv *env, jclass clazz) {
property_set("persist.audio.hdmiin.normal", "true");
}
JNIEXPORT void JNICALL
Java_com_example_nouri_disableHdmiIn(JNIEnv *env, jclass clazz) {
property_set("persist.audio.hdmiin.normal", "false");
}
}
JNIEXPORT jstring JNICALL
Java_com_example_nouri_getStateHdmiIn(JNIEnv *env, jclass clazz) {
char value[100];// __BIONIC_FORTIFY_UNKNOWN_SIZE
property_get("persist.audio.hdmiin.normal", value, "NULL");
return (*env).NewStringUTF(value);
}#define LOG_TAG "Properties_test"
#include <limits.h>
#include <iostream>
#include <sstream>
#include <string>
#include <android/log.h>
#include <android-base/macros.h>
#include <cutils/properties.h>
#include <gtest/gtest.h>
namespace android {
#define STRINGIFY_INNER(x) #x
#define STRINGIFY(x) STRINGIFY_INNER(x)
#define ASSERT_OK(x) ASSERT_EQ(0, (x))
#define EXPECT_OK(x) EXPECT_EQ(0, (x))
#define PROPERTY_TEST_KEY "libcutils.test.key"
#define PROPERTY_TEST_VALUE_DEFAULT "<<<default_value>>>"
template <typename T>
static std::string HexString(T value) {
std::stringstream ss;
ss << "0x" << std::hex << std::uppercase << value;
return ss.str();
}
template <typename T>
static ::testing::AssertionResult AssertEqualHex(const char *mExpr,
const char *nExpr,
T m,
T n) {
if (m == n) {
return ::testing::AssertionSuccess();
}
return ::testing::AssertionFailure()
<< mExpr << " and " << nExpr << " (expected: " << HexString(m) <<
", actual: " << HexString(n) << ") are not equal";
}
class PropertiesTest : public testing::Test {
public:
PropertiesTest() : mValue() {}
protected:
virtual void SetUp() {
EXPECT_OK(property_set(PROPERTY_TEST_KEY, /*value*/NULL));
}
virtual void TearDown() {
EXPECT_OK(property_set(PROPERTY_TEST_KEY, /*value*/NULL));
}
char mValue[PROPERTY_VALUE_MAX];
template <typename T>
static std::string ToString(T value) {
std::stringstream ss;
ss << value;
return ss.str();
}
// Return length of property read; value is written into mValue
int SetAndGetProperty(const char* value, const char* defaultValue = PROPERTY_TEST_VALUE_DEFAULT) {
EXPECT_OK(property_set(PROPERTY_TEST_KEY, value)) << "value: '" << value << "'";
return property_get(PROPERTY_TEST_KEY, mValue, defaultValue);
}
void ResetValue(unsigned char c = 0xFF) {
for (size_t i = 0; i < arraysize(mValue); ++i) {
mValue[i] = (char) c;
}
}
};
TEST_F(PropertiesTest, SetString) {
// Null key -> unsuccessful set
{
// Null key -> fails
EXPECT_GT(0, property_set(/*key*/NULL, PROPERTY_TEST_VALUE_DEFAULT));
}
// Null value -> returns default value
{
// Null value -> OK , and it clears the value
EXPECT_OK(property_set(PROPERTY_TEST_KEY, /*value*/NULL));
ResetValue();
// Since the value is null, default value will be returned
size_t len = property_get(PROPERTY_TEST_KEY, mValue, PROPERTY_TEST_VALUE_DEFAULT);
EXPECT_EQ(strlen(PROPERTY_TEST_VALUE_DEFAULT), len);
EXPECT_STREQ(PROPERTY_TEST_VALUE_DEFAULT, mValue);
}
// Trivial case => get returns what was set
{
size_t len = SetAndGetProperty("hello_world");
EXPECT_EQ(strlen("hello_world"), len) << "hello_world key";
EXPECT_STREQ("hello_world", mValue);
ResetValue();
}
// Set to empty string => get returns default always
{
const char* EMPTY_STRING_DEFAULT = "EMPTY_STRING";
size_t len = SetAndGetProperty("", EMPTY_STRING_DEFAULT);
EXPECT_EQ(strlen(EMPTY_STRING_DEFAULT), len) << "empty key";
EXPECT_STREQ(EMPTY_STRING_DEFAULT, mValue);
ResetValue();
}
// Set to max length => get returns what was set
{
std::string maxLengthString = std::string(PROPERTY_VALUE_MAX-1, 'a');
int len = SetAndGetProperty(maxLengthString.c_str());
EXPECT_EQ(PROPERTY_VALUE_MAX-1, len) << "max length key";
EXPECT_STREQ(maxLengthString.c_str(), mValue);
ResetValue();
}
// Set to max length + 1 => set fails
{
const char* VALID_TEST_VALUE = "VALID_VALUE";
ASSERT_OK(property_set(PROPERTY_TEST_KEY, VALID_TEST_VALUE));
std::string oneLongerString = std::string(PROPERTY_VALUE_MAX, 'a');
// Expect that the value set fails since it's too long
EXPECT_GT(0, property_set(PROPERTY_TEST_KEY, oneLongerString.c_str()));
size_t len = property_get(PROPERTY_TEST_KEY, mValue, PROPERTY_TEST_VALUE_DEFAULT);
EXPECT_EQ(strlen(VALID_TEST_VALUE), len) << "set should've failed";
EXPECT_STREQ(VALID_TEST_VALUE, mValue);
ResetValue();
}
}
TEST_F(PropertiesTest, GetString) {
// Try to use a default value that's too long => get truncates the value
{
ASSERT_OK(property_set(PROPERTY_TEST_KEY, ""));
std::string maxLengthString = std::string(PROPERTY_VALUE_MAX - 1, 'a');
std::string oneLongerString = std::string(PROPERTY_VALUE_MAX, 'a');
// Expect that the value is truncated since it's too long (by 1)
int len = property_get(PROPERTY_TEST_KEY, mValue, oneLongerString.c_str());
EXPECT_EQ(PROPERTY_VALUE_MAX - 1, len);
EXPECT_STREQ(maxLengthString.c_str(), mValue);
ResetValue();
}
// Try to use a default value that's the max length => get succeeds
{
ASSERT_OK(property_set(PROPERTY_TEST_KEY, ""));
std::string maxLengthString = std::string(PROPERTY_VALUE_MAX - 1, 'b');
// Expect that the value matches maxLengthString
int len = property_get(PROPERTY_TEST_KEY, mValue, maxLengthString.c_str());
EXPECT_EQ(PROPERTY_VALUE_MAX - 1, len);
EXPECT_STREQ(maxLengthString.c_str(), mValue);
ResetValue();
}
// Try to use a default value of length one => get succeeds
{
ASSERT_OK(property_set(PROPERTY_TEST_KEY, ""));
std::string oneCharString = std::string(1, 'c');
// Expect that the value matches oneCharString
int len = property_get(PROPERTY_TEST_KEY, mValue, oneCharString.c_str());
EXPECT_EQ(1, len);
EXPECT_STREQ(oneCharString.c_str(), mValue);
ResetValue();
}
// Try to use a default value of length zero => get succeeds
{
ASSERT_OK(property_set(PROPERTY_TEST_KEY, ""));
std::string zeroCharString = std::string(0, 'd');
// Expect that the value matches oneCharString
int len = property_get(PROPERTY_TEST_KEY, mValue, zeroCharString.c_str());
EXPECT_EQ(0, len);
EXPECT_STREQ(zeroCharString.c_str(), mValue);
ResetValue();
}
// Try to use a NULL default value => get returns 0
{
ASSERT_OK(property_set(PROPERTY_TEST_KEY, ""));
// Expect a return value of 0
int len = property_get(PROPERTY_TEST_KEY, mValue, NULL);
EXPECT_EQ(0, len);
ResetValue();
}
}
TEST_F(PropertiesTest, GetBool) {
/**
* TRUE
*/
const char *valuesTrue[] = { "1", "true", "y", "yes", "on", };
for (size_t i = 0; i < arraysize(valuesTrue); ++i) {
ASSERT_OK(property_set(PROPERTY_TEST_KEY, valuesTrue[i]));
bool val = property_get_bool(PROPERTY_TEST_KEY, /*default_value*/false);
EXPECT_TRUE(val) << "Property should've been TRUE for value: '" << valuesTrue[i] << "'";
}
/**
* FALSE
*/
const char *valuesFalse[] = { "0", "false", "n", "no", "off", };
for (size_t i = 0; i < arraysize(valuesFalse); ++i) {
ASSERT_OK(property_set(PROPERTY_TEST_KEY, valuesFalse[i]));
bool val = property_get_bool(PROPERTY_TEST_KEY, /*default_value*/true);
EXPECT_FALSE(val) << "Property shoud've been FALSE For string value: '" << valuesFalse[i] << "'";
}
/**
* NEITHER
*/
const char *valuesNeither[] = { "x0", "x1", "2", "-2", "True", "False", "garbage", "", " ",
"+1", " 1 ", " true", " true ", " y ", " yes", "yes ",
"+0", "-0", "00", " 00 ", " false", "false ",
};
for (size_t i = 0; i < arraysize(valuesNeither); ++i) {
ASSERT_OK(property_set(PROPERTY_TEST_KEY, valuesNeither[i]));
// The default value should always be used
bool val = property_get_bool(PROPERTY_TEST_KEY, /*default_value*/true);
EXPECT_TRUE(val) << "Property should've been NEITHER (true) for string value: '" << valuesNeither[i] << "'";
val = property_get_bool(PROPERTY_TEST_KEY, /*default_value*/false);
EXPECT_FALSE(val) << "Property should've been NEITHER (false) for string value: '" << valuesNeither[i] << "'";
}
}
TEST_F(PropertiesTest, GetInt64) {
const int64_t DEFAULT_VALUE = INT64_C(0xDEADBEEFBEEFDEAD);
const std::string longMaxString = ToString(INT64_MAX);
const std::string longStringOverflow = longMaxString + "0";
const std::string longMinString = ToString(INT64_MIN);
const std::string longStringUnderflow = longMinString + "0";
const char* setValues[] = {
// base 10
"1", "2", "12345", "-1", "-2", "-12345",
// base 16
"0xFF", "0x0FF", "0xC0FFEE",
// base 8
"0", "01234", "07",
// corner cases
" 2", "2 ", "+0", "-0", " +0 ", longMaxString.c_str(), longMinString.c_str(),
// failing cases
NULL, "", " ", " ", "hello", " true ", "y",
longStringOverflow.c_str(), longStringUnderflow.c_str(),
};
int64_t getValues[] = {
// base 10
1, 2, 12345, -1, -2, -12345,
// base 16
0xFF, 0x0FF, 0xC0FFEE,
// base 8
0, 01234, 07,
// corner cases
2, 2, 0, 0, 0, INT64_MAX, INT64_MIN,
// failing cases
DEFAULT_VALUE, DEFAULT_VALUE, DEFAULT_VALUE, DEFAULT_VALUE, DEFAULT_VALUE, DEFAULT_VALUE, DEFAULT_VALUE,
DEFAULT_VALUE, DEFAULT_VALUE,
};
ASSERT_EQ(arraysize(setValues), arraysize(getValues));
for (size_t i = 0; i < arraysize(setValues); ++i) {
ASSERT_OK(property_set(PROPERTY_TEST_KEY, setValues[i]));
int64_t val = property_get_int64(PROPERTY_TEST_KEY, DEFAULT_VALUE);
EXPECT_PRED_FORMAT2(AssertEqualHex, getValues[i], val) << "Property was set to '" << setValues[i] << "'";
}
}
TEST_F(PropertiesTest, GetInt32) {
const int32_t DEFAULT_VALUE = INT32_C(0xDEADBEEF);
const std::string intMaxString = ToString(INT32_MAX);
const std::string intStringOverflow = intMaxString + "0";
const std::string intMinString = ToString(INT32_MIN);
const std::string intStringUnderflow = intMinString + "0";
const char* setValues[] = {
// base 10
"1", "2", "12345", "-1", "-2", "-12345",
// base 16
"0xFF", "0x0FF", "0xC0FFEE", "0Xf00",
// base 8
"0", "01234", "07",
// corner cases
" 2", "2 ", "+0", "-0", " +0 ", intMaxString.c_str(), intMinString.c_str(),
// failing cases
NULL, "", " ", " ", "hello", " true ", "y",
intStringOverflow.c_str(), intStringUnderflow.c_str(),
};
int32_t getValues[] = {
// base 10
1, 2, 12345, -1, -2, -12345,
// base 16
0xFF, 0x0FF, 0xC0FFEE, 0Xf00,
// base 8
0, 01234, 07,
// corner cases
2, 2, 0, 0, 0, INT32_MAX, INT32_MIN,
// failing cases
DEFAULT_VALUE, DEFAULT_VALUE, DEFAULT_VALUE, DEFAULT_VALUE, DEFAULT_VALUE, DEFAULT_VALUE, DEFAULT_VALUE,
DEFAULT_VALUE, DEFAULT_VALUE,
};
ASSERT_EQ(arraysize(setValues), arraysize(getValues));
for (size_t i = 0; i < arraysize(setValues); ++i) {
ASSERT_OK(property_set(PROPERTY_TEST_KEY, setValues[i]));
int32_t val = property_get_int32(PROPERTY_TEST_KEY, DEFAULT_VALUE);
EXPECT_PRED_FORMAT2(AssertEqualHex, getValues[i], val) << "Property was set to '" << setValues[i] << "'";
}
}
} // namespace android