How to execute a .so file if process = new ProcessBuilder(new String[]{"su", "-c", "exec " + mylib.so).start() is returning 0 without any sign of execution happening.
I have compiled a .c file using cmake and storing it as a library (.so). However, when trying to execute the library (which has to run the main() function) nothing is happening while the process exit value is 0 (no error).
I tried to write to a file that I created to test if the library is being executed but nothing happened too. the file remained empty.
int main (int argc, char **argv)
{
LOGW("Running");
FILE* file = fopen("/data/local/tmp/log.txt","w+");
if (file != NULL)
{
fputs("Running\n", file);
fflush(file);
fclose(file);
}}
Moreover, I couldn't find the cmake log file is it because the library has not executed? how can i access the log file then if i added the log library in my cmakelist.txt as follows:
find_library(
log-lib
log )
target_link_libraries(
mylib
${log-lib} )
The execute command did not work instead a workaround was to develop a function that the JAVA class can call which in return call the main function. My Main function needed two arguments a char array (argv) and the length of the array (argc) to be passed.
JNIEXPORT jint JNICALL
yourapp.class.function_name
(JNIEnv *env, jobject object, jobjectArray stringArray) {
int argc = (*env)->GetArrayLength(env, stringArray);
jsize size = (*env)->GetArrayLength(env, stringArray);
char **argv = (char **) malloc(size);
for (int i = 0; i < size; ++i) {
jstring javaString = (jstring) (*env)->GetObjectArrayElement(env, stringArray, i);
const char *nativeString = (*env)->GetStringUTFChars(env, javaString, 0);
argv[i] = strdup(nativeString);
(*env)->ReleaseStringUTFChars(env, javaString, nativeString);
(*env)->DeleteLocalRef(env, javaString);
}
main(argc, argv);
}
As for the logs, they would be available in the debugger or Logcat.