Native getenv function return always null

[Jérôme Haxhiaj]

Hi,

I'm tracking some bugs in an application and found some strange behavior with the function getenv().
It returns automatically null.
I tried with variables USER and TMPDIR, the result remains the same.
This issue occurs on Android 6 and 7, with clang and gcc.

My code is below :

JNIEXPORT jstring JNICALL
Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env,
                                                  jobject thiz )
{
    char *tmp = NULL;

    /* Get temp dir */
    tmp = getenv("TMPDIR");
    __android_log_print(ANDROID_LOG_INFO, "ProcTest", "User is located in %s", tmp);
    
    return (*env)->NewStringUTF(env, "getenv unit test .");
}

Jerome

[Dan Albert]

TMPDIR isn't set on Android. You'll want to pass your app's cache directory through from Java. https://stackoverflow.com/a/6485850/632035

I believe USER is also empty in an app context, as it isn't particularly meaningful.

If you just want to check that getenv exists, try PATH.

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[Jérôme Haxhiaj]

Thank you for your answer.
getenv("PATH") worked fine