src/libandroid: Add actual implementations for the stubbed ALooper functions

this was actually surprisingly easy, since it turns out these
are just C ABI wrappers around the C++ class android::Looper
from AOSP libutils.so, which is a dependency for art that we
therefore compile and distribute alongside it

src/libandroid/looper.c

@@ -1,22 +1,39 @@
 #include <stddef.h>
+#include <stdio.h>
 
-struct ALooper {
+typedef void ALooper;
-	int dummy;
+typedef int (*Looper_callbackFunc)(int fd, int events, void* data);
-};
 
-struct ALooper a_looper;
+void _ZN7android6Looper12getForThreadEv(void **ret); // no clue why itanium ABI does this with return values
-
+ALooper * ALooper_forThread()
-struct ALooper* ALooper_forThread()
 {
-	return &a_looper;
+	void *ret;
+	_ZN7android6Looper12getForThreadEv(&ret);
+	return ret;
 }
 
-struct ALooper* ALooper_prepare(int opts)
+void _ZN7android6Looper7prepareEi(void **ret, int opts); // no clue why itanium ABI does this with return values
+ALooper * ALooper_prepare(int opts)
 {
-	return NULL;
+	void *ret;
+	_ZN7android6Looper7prepareEi(&ret, opts);
+	return ret;
 }
 
+int _ZN7android6Looper7pollAllEiPiS1_PPv(void *this, int timeoutMillis, int* outFd, int* outEvents, void** outData);
 int ALooper_pollAll(int timeoutMillis, int* outFd, int* outEvents, void** outData)
 {
-	return 0;
+	ALooper *looper = ALooper_forThread();
+	if(!looper) {
+		fprintf(stderr, "ALooper_pollAll: ALooper_forThread returned NULL\n");
+		return 0;
+	}
+
+	return _ZN7android6Looper7pollAllEiPiS1_PPv(looper, timeoutMillis, outFd, outEvents,  outData);
+}
+
+int _ZN7android6Looper5addFdEiiiPFiiiPvES1_(void *this, int fd, int ident, int events, Looper_callbackFunc callback, void* data);
+int ALooper_addFd(ALooper* looper, int fd, int ident, int events, Looper_callbackFunc callback, void* data)
+{
+	return _ZN7android6Looper5addFdEiiiPFiiiPvES1_(looper, fd, ident, events, callback, data);
 }

src/libandroid/sensor.c

@@ -18,12 +18,22 @@ typedef void * ALooper_callbackFunc;
 
 struct ASensorManager a_sensor_manager;
 
+// --- sensor manager
+
 struct ASensorManager* ASensorManager_getInstance()
 {
 	return &a_sensor_manager;
 }
 
-// --- sensor manager
+struct ASensorManager* ASensorManager_getInstanceForPackage(const char* packageName)
+{
+	return &a_sensor_manager;
+}
+
+struct ASensor const* ASensorManager_getDefaultSensor(struct ASensorManager* manager, int type)
+{
+	return NULL; // no sensor of this type exists
+}
 
 int ASensorManager_getSensorList(struct ASensorManager* manager, struct ASensorList* list)
 {