/**
* Return created Java virtual machine using private JNI_GetCreatedJavaVMs
* function from the specified library name.
*
* @param name library name used for symbol lookups, can be NULL
* @param log_ctx context used for logging, can be NULL
* @return the current Java virtual machine in use
*/
static JavaVM *get_java_vm(const char *name, void *log_ctx)
{
JavaVM *vm = NULL;
jsize nb_vm = 0;
void *handle = NULL;
jint (*get_created_java_vms) (JavaVM ** vmBuf, jsize bufLen, jsize *nVMs) = NULL;
handle = dlopen(name, RTLD_LOCAL);
if (!handle) {
return NULL;
}
get_created_java_vms = (jint (*)(JavaVM **, jsize, jsize *)) dlsym(handle, "JNI_GetCreatedJavaVMs");
if (!get_created_java_vms) {
av_log(log_ctx, AV_LOG_ERROR, "Could not find JNI_GetCreatedJavaVMs symbol in library '%s'\n", name);
goto done;
}
if (get_created_java_vms(&vm, 1, &nb_vm) != JNI_OK) {
av_log(log_ctx, AV_LOG_ERROR, "Could not get created Java virtual machines\n");
goto done;
}
done:
if (handle) {
dlclose(handle);
}
return vm;
}
static JavaVM *get_java_vm(void)
{
JNI_GetCreatedJavaVMs get_created_java_vms;
gpointer handle = NULL;
static JavaVM *jvm = NULL;
const gchar *error_string;
jsize num_jvms = NULL;
gint lib_index = 0;
gint err;
while (android_runtime_libs[lib_index] && !handle) {
dlerror();
handle = dlopen(android_runtime_libs[lib_index], RTLD_LOCAL | RTLD_LAZY);
error_string = dlerror();
if (error_string) {
g_debug("failed to load %s: %s", android_runtime_libs[lib_index], error_string);
}
if (handle) {
g_debug("Android runtime loaded from %s", android_runtime_libs[lib_index]);
} else {
++lib_index;
}
}
if (handle) {
dlerror();
*(void **) (&get_created_java_vms) = dlsym(handle, "JNI_GetCreatedJavaVMs");
error_string = dlerror();
if (error_string) {
g_warning("dlsym(\"JNI_GetCreatedJavaVMs\") failed: %s", error_string);
return NULL;
}
get_created_java_vms(&jvm, 1, &num_jvms);
if (num_jvms < 1) {
g_debug("get_created_java_vms returned %d jvms", num_jvms);
} else {
g_debug("found existing jvm");
}
err = dlclose(handle);
if (err) {
g_warning("dlclose() of android runtime handle failed");
}
} else {
g_error("Failed to get jvm");
}
return jvm;
}
