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    <p>Make sure that you pass <strong>a valid file name</strong> and <strong>writable directory path</strong> to fopen.</p> <p>I was getting </p> <blockquote> <p>Fatal signal 11 (SIGSEGV) at 0x00000010 (code=1) ...</p> </blockquote> <p>because fopen was trying to open a directory instead of a file.</p> <p>Check the logs in LogCat from Eclipse or using adb logcat for other possible errors.</p> <p>I've tested your code with the following modifications and it works.</p> <p><strong>MainActivity.java</strong>:</p> <pre><code>public class MainActivity { private static final String TAG = MainActivity.class.getName(); static { try { System.loadLibrary("mynativelib"); } catch (UnsatisfiedLinkError ex) { Log.e(TAG, "WARNING: Could not load native library: " + ex.getMessage()); } } public static native int DownloadFile(String downloadDirectoryPath); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); int res = DownloadFile(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + Environment.DIRECTORY_DOWNLOADS + File.separator + "test.jpg"); Log.d(TAG, "Result Code: " + res); } } </code></pre> <p><strong>main-jni.cpp</strong></p> <pre><code>#include &lt;jni.h&gt; #include &lt;android/log.h&gt; #include &lt;string&gt; #include &lt;curl/curl.h&gt; #define LOG_TAG "native" #define LOG_INFO(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__) #define LOG_ERROR(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__) #define LOG_WARN(...) __android_log_print(ANDROID_LOG_WARN, LOG_TAG, __VA_ARGS__) #define LOG_DEBUG(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__) #ifdef __cplusplus extern "C" { #endif // [FIX for Android 4.2.x] // "WARNING: Could not load native library: // Cannot load library: soinfo_relocate(linker.cpp:975): cannot locate symbol "__exidx_end" referenced by" // http://stackoverflow.com/a/14501998/313113 void __exidx_start() { } void __exidx_end() { } size_t write_data(void *ptr, size_t size, size_t count, FILE *stream) { size_t written; written = fwrite(ptr, size, count, stream); LOG_DEBUG("Writing data to file stream %u", written); return written; } jint Java_com_company_awesomeapp_MainActivity_DownloadFile(JNIEnv* env, jobject thiz, jstring downloadDirectoryPath) { CURLcode res; res = curl_global_init(CURL_GLOBAL_ALL); jint temp = 3; LOG_DEBUG("Downloading file"); const char *nativeDownloadDirPath = env-&gt;GetStringUTFChars(downloadDirectoryPath, 0); LOG_DEBUG(nativeDownloadDirPath); CURL *curl; FILE *fp; std::string url = "http://travel.paintedstork.com/blog/wp-content/uploads/2012/10/2013-calendar-images-1.jpg"; curl = curl_easy_init(); if (curl) { fp = fopen(nativeDownloadDirPath, "wb"); res = curl_easy_setopt(curl, CURLOPT_URL, url.c_str()); LOG_DEBUG("Before write function"); res = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data); LOG_DEBUG("After write function"); LOG_DEBUG("Before write data"); res = curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp); LOG_DEBUG("After write data"); res = curl_easy_perform(curl); curl_easy_cleanup(curl); if (fp) fclose(fp); } env-&gt;ReleaseStringUTFChars(downloadDirectoryPath, nativeDownloadDirPath); return res; } /** * The VM calls JNI_OnLoad when the native library is loaded (for example, through System.loadLibrary). * JNI_OnLoad must return the JNI version needed by the native library. * * @see http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/invocation.html#JNI_OnLoad */JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) { JNIEnv* env; if (vm-&gt;GetEnv(reinterpret_cast&lt;void**&gt;(&amp;env), JNI_VERSION_1_6) != JNI_OK) { return -1; } // [*] Get jclass with env-&gt;FindClass. // [*] Register methods with env-&gt;RegisterNatives. //jniRegisterNativeMethods(env, "dev/android/sample/AndroidNDKSampleActivity", sMethods, NELEM(sMethods)); return JNI_VERSION_1_6; } /** * The VM calls JNI_OnUnload when the class loader containing the native library is garbage collected. * This function can be used to perform cleanup operations. * * Because this function is called in an unknown context (such as from a finalizer), * the programmer should be conservative on using Java VM services, and refrain from arbitrary * Java call-backs. * @see http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/invocation.html#JNI_OnUnload */JNIEXPORT void JNI_OnUnload(JavaVM *vm, void *reserved) { } #ifdef __cplusplus } #endif </code></pre> <p>The file will be saved at: /storage/emulated/0/Download/test.jpg</p>
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    1. COThanks a lot for quick response. I have updated the code as per your suggestion but still having the same issue. The name which I was passing from the android application is a valid file name but the variable name was confusing(downloadDirectoryPath). As you have tested the code and its working fine on your side so this means there is no issue with the code right now. Do you think there may be some issue in **libcurl** static library compilation? Or any other tweak which I am missing on my side?
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    2. CO@TMZ What curl version are you using? Does it have http://c-ares.haxx.se support? http://curl.haxx.se/dev/readme-ares.html Using **objdump -a libcurl.a** my libcurl has the following objects: http://paste.kde.org/690056/ Are you sure you have an internet connection on your mobile device on which you are testing the code? I tested the code on a phone with Android 4.2.2 on which there was **no** network connection and I get "CURLE_COULDNT_RESOLVE_HOST" too. If you're using the emulator there may be issues with that environment as well... Have you compiled libcurl for armeabi or armeabi-v7a?
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