diff --git a/libs/binder/AppOpsManager.cpp b/libs/binder/AppOpsManager.cpp
index f3b86ae..4a9b9a7 100644
--- a/libs/binder/AppOpsManager.cpp
+++ b/libs/binder/AppOpsManager.cpp
@@ -42,7 +42,7 @@
 
 static const sp<IBinder>& getToken(const sp<IAppOpsService>& service) {
     pthread_mutex_lock(&gTokenMutex);
-    if (gToken == NULL || gToken->pingBinder() != NO_ERROR) {
+    if (gToken == nullptr || gToken->pingBinder() != NO_ERROR) {
         gToken = service->getToken(new BBinder());
     }
     pthread_mutex_unlock(&gTokenMutex);
@@ -63,16 +63,16 @@
     std::lock_guard<Mutex> scoped_lock(mLock);
     int64_t startTime = 0;
     sp<IAppOpsService> service = mService;
-    while (service == NULL || !IInterface::asBinder(service)->isBinderAlive()) {
+    while (service == nullptr || !IInterface::asBinder(service)->isBinderAlive()) {
         sp<IBinder> binder = defaultServiceManager()->checkService(_appops);
-        if (binder == NULL) {
+        if (binder == nullptr) {
             // Wait for the app ops service to come back...
             if (startTime == 0) {
                 startTime = uptimeMillis();
                 ALOGI("Waiting for app ops service");
             } else if ((uptimeMillis()-startTime) > 10000) {
                 ALOGW("Waiting too long for app ops service, giving up");
-                service = NULL;
+                service = nullptr;
                 break;
             }
             sleep(1);
@@ -88,28 +88,28 @@
 int32_t AppOpsManager::checkOp(int32_t op, int32_t uid, const String16& callingPackage)
 {
     sp<IAppOpsService> service = getService();
-    return service != NULL
+    return service != nullptr
             ? service->checkOperation(op, uid, callingPackage)
             : APP_OPS_MANAGER_UNAVAILABLE_MODE;
 }
 
 int32_t AppOpsManager::noteOp(int32_t op, int32_t uid, const String16& callingPackage) {
     sp<IAppOpsService> service = getService();
-    return service != NULL
+    return service != nullptr
             ? service->noteOperation(op, uid, callingPackage)
             : APP_OPS_MANAGER_UNAVAILABLE_MODE;
 }
 
 int32_t AppOpsManager::startOp(int32_t op, int32_t uid, const String16& callingPackage) {
     sp<IAppOpsService> service = getService();
-    return service != NULL
+    return service != nullptr
             ? service->startOperation(getToken(service), op, uid, callingPackage)
             : APP_OPS_MANAGER_UNAVAILABLE_MODE;
 }
 
 void AppOpsManager::finishOp(int32_t op, int32_t uid, const String16& callingPackage) {
     sp<IAppOpsService> service = getService();
-    if (service != NULL) {
+    if (service != nullptr) {
         service->finishOperation(getToken(service), op, uid, callingPackage);
     }
 }
@@ -117,21 +117,21 @@
 void AppOpsManager::startWatchingMode(int32_t op, const String16& packageName,
         const sp<IAppOpsCallback>& callback) {
     sp<IAppOpsService> service = getService();
-    if (service != NULL) {
+    if (service != nullptr) {
         service->startWatchingMode(op, packageName, callback);
     }
 }
 
 void AppOpsManager::stopWatchingMode(const sp<IAppOpsCallback>& callback) {
     sp<IAppOpsService> service = getService();
-    if (service != NULL) {
+    if (service != nullptr) {
         service->stopWatchingMode(callback);
     }
 }
 
 int32_t AppOpsManager::permissionToOpCode(const String16& permission) {
     sp<IAppOpsService> service = getService();
-    if (service != NULL) {
+    if (service != nullptr) {
         return service->permissionToOpCode(permission);
     }
     return -1;
diff --git a/libs/binder/Binder.cpp b/libs/binder/Binder.cpp
index a81f44e..1bd7c4f 100644
--- a/libs/binder/Binder.cpp
+++ b/libs/binder/Binder.cpp
@@ -43,17 +43,17 @@
 
 sp<IInterface>  IBinder::queryLocalInterface(const String16& /*descriptor*/)
 {
-    return NULL;
+    return nullptr;
 }
 
 BBinder* IBinder::localBinder()
 {
-    return NULL;
+    return nullptr;
 }
 
 BpBinder* IBinder::remoteBinder()
 {
-    return NULL;
+    return nullptr;
 }
 
 bool IBinder::checkSubclass(const void* /*subclassID*/) const
@@ -76,8 +76,8 @@
     for (size_t i = 0; i < numArgs; i++) {
         send.writeString16(args[i]);
     }
-    send.writeStrongBinder(callback != NULL ? IInterface::asBinder(callback) : NULL);
-    send.writeStrongBinder(resultReceiver != NULL ? IInterface::asBinder(resultReceiver) : NULL);
+    send.writeStrongBinder(callback != nullptr ? IInterface::asBinder(callback) : nullptr);
+    send.writeStrongBinder(resultReceiver != nullptr ? IInterface::asBinder(resultReceiver) : nullptr);
     return target->transact(SHELL_COMMAND_TRANSACTION, send, &reply);
 }
 
@@ -130,7 +130,7 @@
             break;
     }
 
-    if (reply != NULL) {
+    if (reply != nullptr) {
         reply->setDataPosition(0);
     }
 
@@ -171,7 +171,7 @@
             delete e;
             e = expected;  // Filled in by CAS
         }
-        if (e == 0) return; // out of memory
+        if (e == nullptr) return; // out of memory
     }
 
     AutoMutex _l(e->mLock);
@@ -181,7 +181,7 @@
 void* BBinder::findObject(const void* objectID) const
 {
     Extras* e = mExtras.load(std::memory_order_acquire);
-    if (!e) return NULL;
+    if (!e) return nullptr;
 
     AutoMutex _l(e->mLock);
     return e->mObjects.find(objectID);
@@ -246,7 +246,7 @@
             (void)out;
             (void)err;
 
-            if (resultReceiver != NULL) {
+            if (resultReceiver != nullptr) {
                 resultReceiver->send(INVALID_OPERATION);
             }
 
@@ -273,7 +273,7 @@
 };
 
 BpRefBase::BpRefBase(const sp<IBinder>& o)
-    : mRemote(o.get()), mRefs(NULL), mState(0)
+    : mRemote(o.get()), mRefs(nullptr), mState(0)
 {
     extendObjectLifetime(OBJECT_LIFETIME_WEAK);
 
diff --git a/libs/binder/BpBinder.cpp b/libs/binder/BpBinder.cpp
index c0e0296..49ff460 100644
--- a/libs/binder/BpBinder.cpp
+++ b/libs/binder/BpBinder.cpp
@@ -62,7 +62,7 @@
 void* BpBinder::ObjectManager::find(const void* objectID) const
 {
     const ssize_t i = mObjects.indexOfKey(objectID);
-    if (i < 0) return NULL;
+    if (i < 0) return nullptr;
     return mObjects.valueAt(i).object;
 }
 
@@ -77,7 +77,7 @@
     ALOGV("Killing %zu objects in manager %p", N, this);
     for (size_t i=0; i<N; i++) {
         const entry_t& e = mObjects.valueAt(i);
-        if (e.func != NULL) {
+        if (e.func != nullptr) {
             e.func(mObjects.keyAt(i), e.object, e.cleanupCookie);
         }
     }
@@ -91,7 +91,7 @@
     : mHandle(handle)
     , mAlive(1)
     , mObitsSent(0)
-    , mObituaries(NULL)
+    , mObituaries(nullptr)
 {
     ALOGV("Creating BpBinder %p handle %d\n", this, mHandle);
 
@@ -179,7 +179,7 @@
     ob.cookie = cookie;
     ob.flags = flags;
 
-    LOG_ALWAYS_FATAL_IF(recipient == NULL,
+    LOG_ALWAYS_FATAL_IF(recipient == nullptr,
                         "linkToDeath(): recipient must be non-NULL");
 
     {
@@ -219,9 +219,9 @@
     for (size_t i=0; i<N; i++) {
         const Obituary& obit = mObituaries->itemAt(i);
         if ((obit.recipient == recipient
-                    || (recipient == NULL && obit.cookie == cookie))
+                    || (recipient == nullptr && obit.cookie == cookie))
                 && obit.flags == flags) {
-            if (outRecipient != NULL) {
+            if (outRecipient != nullptr) {
                 *outRecipient = mObituaries->itemAt(i).recipient;
             }
             mObituaries->removeAt(i);
@@ -231,7 +231,7 @@
                 self->clearDeathNotification(mHandle, this);
                 self->flushCommands();
                 delete mObituaries;
-                mObituaries = NULL;
+                mObituaries = nullptr;
             }
             return NO_ERROR;
         }
@@ -250,12 +250,12 @@
 
     mLock.lock();
     Vector<Obituary>* obits = mObituaries;
-    if(obits != NULL) {
+    if(obits != nullptr) {
         ALOGV("Clearing sent death notification: %p handle %d\n", this, mHandle);
         IPCThreadState* self = IPCThreadState::self();
         self->clearDeathNotification(mHandle, this);
         self->flushCommands();
-        mObituaries = NULL;
+        mObituaries = nullptr;
     }
     mObitsSent = 1;
     mLock.unlock();
@@ -263,7 +263,7 @@
     ALOGV("Reporting death of proxy %p for %zu recipients\n",
         this, obits ? obits->size() : 0U);
 
-    if (obits != NULL) {
+    if (obits != nullptr) {
         const size_t N = obits->size();
         for (size_t i=0; i<N; i++) {
             reportOneDeath(obits->itemAt(i));
@@ -277,7 +277,7 @@
 {
     sp<DeathRecipient> recipient = obit.recipient.promote();
     ALOGV("Reporting death to recipient: %p\n", recipient.get());
-    if (recipient == NULL) return;
+    if (recipient == nullptr) return;
 
     recipient->binderDied(this);
 }
@@ -317,13 +317,13 @@
 
     mLock.lock();
     Vector<Obituary>* obits = mObituaries;
-    if(obits != NULL) {
+    if(obits != nullptr) {
         if (ipc) ipc->clearDeathNotification(mHandle, this);
-        mObituaries = NULL;
+        mObituaries = nullptr;
     }
     mLock.unlock();
 
-    if (obits != NULL) {
+    if (obits != nullptr) {
         // XXX Should we tell any remaining DeathRecipient
         // objects that the last strong ref has gone away, so they
         // are no longer linked?
diff --git a/libs/binder/BufferedTextOutput.cpp b/libs/binder/BufferedTextOutput.cpp
index 30e70b0..0946aca 100644
--- a/libs/binder/BufferedTextOutput.cpp
+++ b/libs/binder/BufferedTextOutput.cpp
@@ -36,7 +36,7 @@
 {
     explicit BufferState(int32_t _seq)
         : seq(_seq)
-        , buffer(NULL)
+        , buffer(nullptr)
         , bufferPos(0)
         , bufferSize(0)
         , atFront(true)
@@ -266,13 +266,13 @@
     if ((mFlags&MULTITHREADED) != 0) {
         ThreadState* ts = getThreadState();
         if (ts) {
-            while (ts->states.size() <= (size_t)mIndex) ts->states.add(NULL);
+            while (ts->states.size() <= (size_t)mIndex) ts->states.add(nullptr);
             BufferState* bs = ts->states[mIndex].get();
-            if (bs != NULL && bs->seq == mSeq) return bs;
+            if (bs != nullptr && bs->seq == mSeq) return bs;
             
             ts->states.editItemAt(mIndex) = new BufferState(mIndex);
             bs = ts->states[mIndex].get();
-            if (bs != NULL) return bs;
+            if (bs != nullptr) return bs;
         }
     }
     
diff --git a/libs/binder/Debug.cpp b/libs/binder/Debug.cpp
index 4ac61a3..f38bbb2 100644
--- a/libs/binder/Debug.cpp
+++ b/libs/binder/Debug.cpp
@@ -165,13 +165,13 @@
         else if (bytesPerLine >= 8) alignment = 2;
         else alignment = 1;
     }
-    if (func == NULL) func = defaultPrintFunc;
+    if (func == nullptr) func = defaultPrintFunc;
 
     size_t offset;
 
     unsigned char *pos = (unsigned char *)buf;
 
-    if (pos == NULL) {
+    if (pos == nullptr) {
         if (singleLineBytesCutoff < 0) func(cookie, "\n");
         func(cookie, "(NULL)");
         return;
@@ -297,7 +297,7 @@
 
 ssize_t getBinderKernelReferences(size_t count, uintptr_t* buf) {
     sp<ProcessState> proc = ProcessState::selfOrNull();
-    if (proc.get() == NULL) {
+    if (proc.get() == nullptr) {
         return 0;
     }
 
diff --git a/libs/binder/IAppOpsService.cpp b/libs/binder/IAppOpsService.cpp
index 638ae5c..c38568c 100644
--- a/libs/binder/IAppOpsService.cpp
+++ b/libs/binder/IAppOpsService.cpp
@@ -108,7 +108,7 @@
         data.writeStrongBinder(clientToken);
         remote()->transact(GET_TOKEN_TRANSACTION, data, &reply);
         // fail on exception
-        if (reply.readExceptionCode() != 0) return NULL;
+        if (reply.readExceptionCode() != 0) return nullptr;
         return reply.readStrongBinder();
     }
 
diff --git a/libs/binder/IInterface.cpp b/libs/binder/IInterface.cpp
index 2fcd3d9..6b77291 100644
--- a/libs/binder/IInterface.cpp
+++ b/libs/binder/IInterface.cpp
@@ -32,14 +32,14 @@
 // static
 sp<IBinder> IInterface::asBinder(const IInterface* iface)
 {
-    if (iface == NULL) return NULL;
+    if (iface == nullptr) return nullptr;
     return const_cast<IInterface*>(iface)->onAsBinder();
 }
 
 // static
 sp<IBinder> IInterface::asBinder(const sp<IInterface>& iface)
 {
-    if (iface == NULL) return NULL;
+    if (iface == nullptr) return nullptr;
     return iface->onAsBinder();
 }
 
diff --git a/libs/binder/IMemory.cpp b/libs/binder/IMemory.cpp
index 5c1a4f4..7afec45 100644
--- a/libs/binder/IMemory.cpp
+++ b/libs/binder/IMemory.cpp
@@ -130,7 +130,7 @@
 public:
     explicit BpMemory(const sp<IBinder>& impl);
     virtual ~BpMemory();
-    virtual sp<IMemoryHeap> getMemory(ssize_t* offset=0, size_t* size=0) const;
+    virtual sp<IMemoryHeap> getMemory(ssize_t* offset=nullptr, size_t* size=nullptr) const;
 
 private:
     mutable sp<IMemoryHeap> mHeap;
@@ -145,22 +145,22 @@
     sp<IMemoryHeap> realHeap = BpMemoryHeap::get_heap(binder);
     void* const base = realHeap->base();
     if (base == MAP_FAILED)
-        return 0;
+        return nullptr;
     return static_cast<char*>(base) + offset;
 }
 
 void* IMemory::pointer() const {
     ssize_t offset;
     sp<IMemoryHeap> heap = getMemory(&offset);
-    void* const base = heap!=0 ? heap->base() : MAP_FAILED;
+    void* const base = heap!=nullptr ? heap->base() : MAP_FAILED;
     if (base == MAP_FAILED)
-        return 0;
+        return nullptr;
     return static_cast<char*>(base) + offset;
 }
 
 size_t IMemory::size() const {
     size_t size;
-    getMemory(NULL, &size);
+    getMemory(nullptr, &size);
     return size;
 }
 
@@ -183,16 +183,16 @@
 
 sp<IMemoryHeap> BpMemory::getMemory(ssize_t* offset, size_t* size) const
 {
-    if (mHeap == 0) {
+    if (mHeap == nullptr) {
         Parcel data, reply;
         data.writeInterfaceToken(IMemory::getInterfaceDescriptor());
         if (remote()->transact(GET_MEMORY, data, &reply) == NO_ERROR) {
             sp<IBinder> heap = reply.readStrongBinder();
             ssize_t o = reply.readInt32();
             size_t s = reply.readInt32();
-            if (heap != 0) {
+            if (heap != nullptr) {
                 mHeap = interface_cast<IMemoryHeap>(heap);
-                if (mHeap != 0) {
+                if (mHeap != nullptr) {
                     size_t heapSize = mHeap->getSize();
                     if (s <= heapSize
                             && o >= 0
@@ -202,7 +202,7 @@
                     } else {
                         // Hm.
                         android_errorWriteWithInfoLog(0x534e4554,
-                            "26877992", -1, NULL, 0);
+                            "26877992", -1, nullptr, 0);
                         mOffset = 0;
                         mSize = 0;
                     }
@@ -212,7 +212,7 @@
     }
     if (offset) *offset = mOffset;
     if (size) *size = mSize;
-    return (mSize > 0) ? mHeap : 0;
+    return (mSize > 0) ? mHeap : nullptr;
 }
 
 // ---------------------------------------------------------------------------
@@ -334,7 +334,7 @@
                 access |= PROT_WRITE;
             }
             mRealHeap = true;
-            mBase = mmap(0, size, access, MAP_SHARED, fd, offset);
+            mBase = mmap(nullptr, size, access, MAP_SHARED, fd, offset);
             if (mBase == MAP_FAILED) {
                 ALOGE("cannot map BpMemoryHeap (binder=%p), size=%zd, fd=%d (%s)",
                         IInterface::asBinder(this).get(), size, fd, strerror(errno));
diff --git a/libs/binder/IPCThreadState.cpp b/libs/binder/IPCThreadState.cpp
index ba9bf61..33ec65f 100644
--- a/libs/binder/IPCThreadState.cpp
+++ b/libs/binder/IPCThreadState.cpp
@@ -289,7 +289,7 @@
 
     if (gShutdown) {
         ALOGW("Calling IPCThreadState::self() during shutdown is dangerous, expect a crash.\n");
-        return NULL;
+        return nullptr;
     }
 
     pthread_mutex_lock(&gTLSMutex);
@@ -299,7 +299,7 @@
             pthread_mutex_unlock(&gTLSMutex);
             ALOGW("IPCThreadState::self() unable to create TLS key, expect a crash: %s\n",
                     strerror(key_create_value));
-            return NULL;
+            return nullptr;
         }
         gHaveTLS = true;
     }
@@ -314,7 +314,7 @@
         IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k);
         return st;
     }
-    return NULL;
+    return nullptr;
 }
 
 void IPCThreadState::shutdown()
@@ -326,7 +326,7 @@
         IPCThreadState* st = (IPCThreadState*)pthread_getspecific(gTLS);
         if (st) {
             delete st;
-            pthread_setspecific(gTLS, NULL);
+            pthread_setspecific(gTLS, nullptr);
         }
         pthread_key_delete(gTLS);
         gHaveTLS = false;
@@ -584,7 +584,7 @@
 
     LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(),
         (flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY");
-    err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL);
+    err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, nullptr);
 
     if (err != NO_ERROR) {
         if (reply) reply->setError(err);
@@ -621,7 +621,7 @@
             else alog << "(none requested)" << endl;
         }
     } else {
-        err = waitForResponse(NULL, NULL);
+        err = waitForResponse(nullptr, nullptr);
     }
 
     return err;
@@ -725,7 +725,7 @@
     err = writeTransactionData(BC_REPLY, flags, -1, 0, reply, &statusBuffer);
     if (err < NO_ERROR) return err;
 
-    return waitForResponse(NULL, NULL);
+    return waitForResponse(nullptr, nullptr);
 }
 
 status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult)
@@ -785,14 +785,14 @@
                             freeBuffer, this);
                     } else {
                         err = *reinterpret_cast<const status_t*>(tr.data.ptr.buffer);
-                        freeBuffer(NULL,
+                        freeBuffer(nullptr,
                             reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
                             tr.data_size,
                             reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets),
                             tr.offsets_size/sizeof(binder_size_t), this);
                     }
                 } else {
-                    freeBuffer(NULL,
+                    freeBuffer(nullptr,
                         reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
                         tr.data_size,
                         reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets),
@@ -1185,7 +1185,7 @@
         alog << "Writing BC_FREE_BUFFER for " << data << endl;
     }
     ALOG_ASSERT(data != NULL, "Called with NULL data");
-    if (parcel != NULL) parcel->closeFileDescriptors();
+    if (parcel != nullptr) parcel->closeFileDescriptors();
     IPCThreadState* state = self();
     state->mOut.writeInt32(BC_FREE_BUFFER);
     state->mOut.writePointer((uintptr_t)data);
diff --git a/libs/binder/IResultReceiver.cpp b/libs/binder/IResultReceiver.cpp
index 646809e..14b5259 100644
--- a/libs/binder/IResultReceiver.cpp
+++ b/libs/binder/IResultReceiver.cpp
@@ -40,7 +40,7 @@
         Parcel data;
         data.writeInterfaceToken(IResultReceiver::getInterfaceDescriptor());
         data.writeInt32(resultCode);
-        remote()->transact(OP_SEND, data, NULL, IBinder::FLAG_ONEWAY);
+        remote()->transact(OP_SEND, data, nullptr, IBinder::FLAG_ONEWAY);
     }
 };
 
@@ -56,7 +56,7 @@
             CHECK_INTERFACE(IResultReceiver, data, reply);
             int32_t resultCode = data.readInt32();
             send(resultCode);
-            if (reply != NULL) {
+            if (reply != nullptr) {
                 reply->writeNoException();
             }
             return NO_ERROR;
diff --git a/libs/binder/IServiceManager.cpp b/libs/binder/IServiceManager.cpp
index c7a0f43..001dc9e 100644
--- a/libs/binder/IServiceManager.cpp
+++ b/libs/binder/IServiceManager.cpp
@@ -33,14 +33,14 @@
 
 sp<IServiceManager> defaultServiceManager()
 {
-    if (gDefaultServiceManager != NULL) return gDefaultServiceManager;
+    if (gDefaultServiceManager != nullptr) return gDefaultServiceManager;
 
     {
         AutoMutex _l(gDefaultServiceManagerLock);
-        while (gDefaultServiceManager == NULL) {
+        while (gDefaultServiceManager == nullptr) {
             gDefaultServiceManager = interface_cast<IServiceManager>(
-                ProcessState::self()->getContextObject(NULL));
-            if (gDefaultServiceManager == NULL)
+                ProcessState::self()->getContextObject(nullptr));
+            if (gDefaultServiceManager == nullptr)
                 sleep(1);
         }
     }
@@ -50,7 +50,7 @@
 
 bool checkCallingPermission(const String16& permission)
 {
-    return checkCallingPermission(permission, NULL, NULL);
+    return checkCallingPermission(permission, nullptr, nullptr);
 }
 
 static String16 _permission("permission");
@@ -76,7 +76,7 @@
     int64_t startTime = 0;
 
     while (true) {
-        if (pc != NULL) {
+        if (pc != nullptr) {
             bool res = pc->checkPermission(permission, pid, uid);
             if (res) {
                 if (startTime != 0) {
@@ -97,14 +97,14 @@
             // Object is dead!
             gDefaultServiceManagerLock.lock();
             if (gPermissionController == pc) {
-                gPermissionController = NULL;
+                gPermissionController = nullptr;
             }
             gDefaultServiceManagerLock.unlock();
         }
 
         // Need to retrieve the permission controller.
         sp<IBinder> binder = defaultServiceManager()->checkService(_permission);
-        if (binder == NULL) {
+        if (binder == nullptr) {
             // Wait for the permission controller to come back...
             if (startTime == 0) {
                 startTime = uptimeMillis();
@@ -146,9 +146,9 @@
                 sleep(1);
             }
             sp<IBinder> svc = checkService(name);
-            if (svc != NULL) return svc;
+            if (svc != nullptr) return svc;
         }
-        return NULL;
+        return nullptr;
     }
 
     virtual sp<IBinder> checkService( const String16& name) const
diff --git a/libs/binder/IShellCallback.cpp b/libs/binder/IShellCallback.cpp
index c793df3..4568a42 100644
--- a/libs/binder/IShellCallback.cpp
+++ b/libs/binder/IShellCallback.cpp
@@ -65,7 +65,7 @@
             String16 path(data.readString16());
             String16 seLinuxContext(data.readString16());
             int fd = openOutputFile(path, seLinuxContext);
-            if (reply != NULL) {
+            if (reply != nullptr) {
                 reply->writeNoException();
                 if (fd >= 0) {
                     reply->writeInt32(1);
diff --git a/libs/binder/MemoryDealer.cpp b/libs/binder/MemoryDealer.cpp
index 1cfe02a..eacad3b 100644
--- a/libs/binder/MemoryDealer.cpp
+++ b/libs/binder/MemoryDealer.cpp
@@ -52,8 +52,8 @@
     NODE*  mLast;
 
 public:
-                LinkedList() : mFirst(0), mLast(0) { }
-    bool        isEmpty() const { return mFirst == 0; }
+                LinkedList() : mFirst(nullptr), mLast(nullptr) { }
+    bool        isEmpty() const { return mFirst == nullptr; }
     NODE const* head() const { return mFirst; }
     NODE*       head() { return mFirst; }
     NODE const* tail() const { return mLast; }
@@ -62,7 +62,7 @@
     void insertAfter(NODE* node, NODE* newNode) {
         newNode->prev = node;
         newNode->next = node->next;
-        if (node->next == 0) mLast = newNode;
+        if (node->next == nullptr) mLast = newNode;
         else                 node->next->prev = newNode;
         node->next = newNode;
     }
@@ -70,17 +70,17 @@
     void insertBefore(NODE* node, NODE* newNode) {
          newNode->prev = node->prev;
          newNode->next = node;
-         if (node->prev == 0)   mFirst = newNode;
+         if (node->prev == nullptr)   mFirst = newNode;
          else                   node->prev->next = newNode;
          node->prev = newNode;
     }
 
     void insertHead(NODE* newNode) {
-        if (mFirst == 0) {
+        if (mFirst == nullptr) {
             mFirst = mLast = newNode;
-            newNode->prev = newNode->next = 0;
+            newNode->prev = newNode->next = nullptr;
         } else {
-            newNode->prev = 0;
+            newNode->prev = nullptr;
             newNode->next = mFirst;
             mFirst->prev = newNode;
             mFirst = newNode;
@@ -99,9 +99,9 @@
     }
 
     NODE* remove(NODE* node) {
-        if (node->prev == 0)    mFirst = node->next;
+        if (node->prev == nullptr)    mFirst = node->next;
         else                    node->prev->next = node->next;
-        if (node->next == 0)    mLast = node->prev;
+        if (node->next == nullptr)    mLast = node->prev;
         else                    node->next->prev = node->prev;
         return node;
     }
@@ -141,7 +141,7 @@
 
     struct chunk_t {
         chunk_t(size_t start, size_t size)
-        : start(start), size(size), free(1), prev(0), next(0) {
+        : start(start), size(size), free(1), prev(nullptr), next(nullptr) {
         }
         size_t              start;
         size_t              size : 28;
@@ -329,7 +329,7 @@
         return 0;
     }
     size = (size + kMemoryAlign-1) / kMemoryAlign;
-    chunk_t* free_chunk = 0;
+    chunk_t* free_chunk = nullptr;
     chunk_t* cur = mList.head();
 
     size_t pagesize = getpagesize();
@@ -418,7 +418,7 @@
         }
         cur = cur->next;
     }
-    return 0;
+    return nullptr;
 }
 
 void SimpleBestFitAllocator::dump(const char* what) const
diff --git a/libs/binder/MemoryHeapBase.cpp b/libs/binder/MemoryHeapBase.cpp
index 03f00be..9850ad9 100644
--- a/libs/binder/MemoryHeapBase.cpp
+++ b/libs/binder/MemoryHeapBase.cpp
@@ -36,17 +36,17 @@
 
 MemoryHeapBase::MemoryHeapBase()
     : mFD(-1), mSize(0), mBase(MAP_FAILED),
-      mDevice(NULL), mNeedUnmap(false), mOffset(0)
+      mDevice(nullptr), mNeedUnmap(false), mOffset(0)
 {
 }
 
 MemoryHeapBase::MemoryHeapBase(size_t size, uint32_t flags, char const * name)
     : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
-      mDevice(0), mNeedUnmap(false), mOffset(0)
+      mDevice(nullptr), mNeedUnmap(false), mOffset(0)
 {
     const size_t pagesize = getpagesize();
     size = ((size + pagesize-1) & ~(pagesize-1));
-    int fd = ashmem_create_region(name == NULL ? "MemoryHeapBase" : name, size);
+    int fd = ashmem_create_region(name == nullptr ? "MemoryHeapBase" : name, size);
     ALOGE_IF(fd<0, "error creating ashmem region: %s", strerror(errno));
     if (fd >= 0) {
         if (mapfd(fd, size) == NO_ERROR) {
@@ -59,7 +59,7 @@
 
 MemoryHeapBase::MemoryHeapBase(const char* device, size_t size, uint32_t flags)
     : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
-      mDevice(0), mNeedUnmap(false), mOffset(0)
+      mDevice(nullptr), mNeedUnmap(false), mOffset(0)
 {
     int open_flags = O_RDWR;
     if (flags & NO_CACHING)
@@ -78,7 +78,7 @@
 
 MemoryHeapBase::MemoryHeapBase(int fd, size_t size, uint32_t flags, uint32_t offset)
     : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
-      mDevice(0), mNeedUnmap(false), mOffset(0)
+      mDevice(nullptr), mNeedUnmap(false), mOffset(0)
 {
     const size_t pagesize = getpagesize();
     size = ((size + pagesize-1) & ~(pagesize-1));
@@ -109,7 +109,7 @@
     }
 
     if ((mFlags & DONT_MAP_LOCALLY) == 0) {
-        void* base = (uint8_t*)mmap(0, size,
+        void* base = (uint8_t*)mmap(nullptr, size,
                 PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset);
         if (base == MAP_FAILED) {
             ALOGE("mmap(fd=%d, size=%u) failed (%s)",
@@ -121,7 +121,7 @@
         mBase = base;
         mNeedUnmap = true;
     } else  {
-        mBase = 0; // not MAP_FAILED
+        mBase = nullptr; // not MAP_FAILED
         mNeedUnmap = false;
     }
     mFD = fd;
@@ -143,7 +143,7 @@
             //ALOGD("munmap(fd=%d, base=%p, size=%lu)", fd, mBase, mSize);
             munmap(mBase, mSize);
         }
-        mBase = 0;
+        mBase = nullptr;
         mSize = 0;
         close(fd);
     }
diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index f739f07..03aef17 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -117,7 +117,7 @@
             return;
         case BINDER_TYPE_HANDLE: {
             const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
-            if (b != NULL) {
+            if (b != nullptr) {
                 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get());
                 b->incStrong(who);
             }
@@ -125,11 +125,11 @@
         }
         case BINDER_TYPE_WEAK_HANDLE: {
             const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
-            if (b != NULL) b.get_refs()->incWeak(who);
+            if (b != nullptr) b.get_refs()->incWeak(who);
             return;
         }
         case BINDER_TYPE_FD: {
-            if ((obj.cookie != 0) && (outAshmemSize != NULL) && ashmem_valid(obj.handle)) {
+            if ((obj.cookie != 0) && (outAshmemSize != nullptr) && ashmem_valid(obj.handle)) {
                 // If we own an ashmem fd, keep track of how much memory it refers to.
                 int size = ashmem_get_size_region(obj.handle);
                 if (size > 0) {
@@ -146,7 +146,7 @@
 void acquire_object(const sp<ProcessState>& proc,
     const flat_binder_object& obj, const void* who)
 {
-    acquire_object(proc, obj, who, NULL);
+    acquire_object(proc, obj, who, nullptr);
 }
 
 static void release_object(const sp<ProcessState>& proc,
@@ -165,7 +165,7 @@
             return;
         case BINDER_TYPE_HANDLE: {
             const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle);
-            if (b != NULL) {
+            if (b != nullptr) {
                 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get());
                 b->decStrong(who);
             }
@@ -173,12 +173,12 @@
         }
         case BINDER_TYPE_WEAK_HANDLE: {
             const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle);
-            if (b != NULL) b.get_refs()->decWeak(who);
+            if (b != nullptr) b.get_refs()->decWeak(who);
             return;
         }
         case BINDER_TYPE_FD: {
             if (obj.cookie != 0) { // owned
-                if ((outAshmemSize != NULL) && ashmem_valid(obj.handle)) {
+                if ((outAshmemSize != nullptr) && ashmem_valid(obj.handle)) {
                     int size = ashmem_get_size_region(obj.handle);
                     if (size > 0) {
                         *outAshmemSize -= size;
@@ -197,7 +197,7 @@
 void release_object(const sp<ProcessState>& proc,
     const flat_binder_object& obj, const void* who)
 {
-    release_object(proc, obj, who, NULL);
+    release_object(proc, obj, who, nullptr);
 }
 
 inline static status_t finish_flatten_binder(
@@ -219,11 +219,11 @@
         obj.flags = 0x13 | FLAT_BINDER_FLAG_ACCEPTS_FDS;
     }
 
-    if (binder != NULL) {
+    if (binder != nullptr) {
         IBinder *local = binder->localBinder();
         if (!local) {
             BpBinder *proxy = binder->remoteBinder();
-            if (proxy == NULL) {
+            if (proxy == nullptr) {
                 ALOGE("null proxy");
             }
             const int32_t handle = proxy ? proxy->handle() : 0;
@@ -251,13 +251,13 @@
     flat_binder_object obj;
 
     obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
-    if (binder != NULL) {
+    if (binder != nullptr) {
         sp<IBinder> real = binder.promote();
-        if (real != NULL) {
+        if (real != nullptr) {
             IBinder *local = real->localBinder();
             if (!local) {
                 BpBinder *proxy = real->remoteBinder();
-                if (proxy == NULL) {
+                if (proxy == nullptr) {
                     ALOGE("null proxy");
                 }
                 const int32_t handle = proxy ? proxy->handle() : 0;
@@ -284,13 +284,13 @@
         obj.hdr.type = BINDER_TYPE_BINDER;
         obj.binder = 0;
         obj.cookie = 0;
-        return finish_flatten_binder(NULL, obj, out);
+        return finish_flatten_binder(nullptr, obj, out);
 
     } else {
         obj.hdr.type = BINDER_TYPE_BINDER;
         obj.binder = 0;
         obj.cookie = 0;
-        return finish_flatten_binder(NULL, obj, out);
+        return finish_flatten_binder(nullptr, obj, out);
     }
 }
 
@@ -310,7 +310,7 @@
         switch (flat->hdr.type) {
             case BINDER_TYPE_BINDER:
                 *out = reinterpret_cast<IBinder*>(flat->cookie);
-                return finish_unflatten_binder(NULL, *flat, in);
+                return finish_unflatten_binder(nullptr, *flat, in);
             case BINDER_TYPE_HANDLE:
                 *out = proc->getStrongProxyForHandle(flat->handle);
                 return finish_unflatten_binder(
@@ -329,16 +329,16 @@
         switch (flat->hdr.type) {
             case BINDER_TYPE_BINDER:
                 *out = reinterpret_cast<IBinder*>(flat->cookie);
-                return finish_unflatten_binder(NULL, *flat, in);
+                return finish_unflatten_binder(nullptr, *flat, in);
             case BINDER_TYPE_WEAK_BINDER:
                 if (flat->binder != 0) {
                     out->set_object_and_refs(
                         reinterpret_cast<IBinder*>(flat->cookie),
                         reinterpret_cast<RefBase::weakref_type*>(flat->binder));
                 } else {
-                    *out = NULL;
+                    *out = nullptr;
                 }
-                return finish_unflatten_binder(NULL, *flat, in);
+                return finish_unflatten_binder(nullptr, *flat, in);
             case BINDER_TYPE_HANDLE:
             case BINDER_TYPE_WEAK_HANDLE:
                 *out = proc->getWeakProxyForHandle(flat->handle);
@@ -525,7 +525,7 @@
             if (newSize*sizeof(binder_size_t) < mObjectsSize) return NO_MEMORY;   // overflow
             binder_size_t *objects =
                 (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
-            if (objects == (binder_size_t*)0) {
+            if (objects == (binder_size_t*)nullptr) {
                 return NO_MEMORY;
             }
             mObjects = objects;
@@ -613,7 +613,7 @@
                               IPCThreadState* threadState) const
 {
     int32_t strictPolicy = readInt32();
-    if (threadState == NULL) {
+    if (threadState == nullptr) {
         threadState = IPCThreadState::self();
     }
     if ((threadState->getLastTransactionBinderFlags() &
@@ -721,14 +721,14 @@
     if (len > INT32_MAX) {
         // don't accept size_t values which may have come from an
         // inadvertent conversion from a negative int.
-        return NULL;
+        return nullptr;
     }
 
     const size_t padded = pad_size(len);
 
     // sanity check for integer overflow
     if (mDataPos+padded < mDataPos) {
-        return NULL;
+        return nullptr;
     }
 
     if ((mDataPos+padded) <= mDataCapacity) {
@@ -759,7 +759,7 @@
 
     status_t err = growData(padded);
     if (err == NO_ERROR) goto restart_write;
-    return NULL;
+    return nullptr;
 }
 
 status_t Parcel::writeUtf8AsUtf16(const std::string& str) {
@@ -1062,7 +1062,7 @@
 
 status_t Parcel::writeString16(const char16_t* str, size_t len)
 {
-    if (str == NULL) return writeInt32(-1);
+    if (str == nullptr) return writeInt32(-1);
 
     status_t err = writeInt32(len);
     if (err == NO_ERROR) {
@@ -1220,7 +1220,7 @@
     if (result < 0) {
         status = result;
     } else {
-        void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+        void* ptr = ::mmap(nullptr, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
         if (ptr == MAP_FAILED) {
             status = -errno;
         } else {
@@ -1277,10 +1277,10 @@
 
     // payload
     void* const buf = this->writeInplace(pad_size(len));
-    if (buf == NULL)
+    if (buf == nullptr)
         return BAD_VALUE;
 
-    int* fds = NULL;
+    int* fds = nullptr;
     if (fd_count) {
         fds = new (std::nothrow) int[fd_count];
         if (fds == nullptr) {
@@ -1336,7 +1336,7 @@
         size_t newSize = ((mObjectsSize+2)*3)/2;
         if (newSize*sizeof(binder_size_t) < mObjectsSize) return NO_MEMORY;   // overflow
         binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t));
-        if (objects == NULL) return NO_MEMORY;
+        if (objects == nullptr) return NO_MEMORY;
         mObjects = objects;
         mObjectsCapacity = newSize;
     }
@@ -1382,7 +1382,7 @@
 
 status_t Parcel::writeNullableMap(const std::unique_ptr<binder::Map>& map)
 {
-    if (map == NULL) {
+    if (map == nullptr) {
         return writeInt32(-1);
     }
 
@@ -1492,7 +1492,7 @@
     if (len > INT32_MAX) {
         // don't accept size_t values which may have come from an
         // inadvertent conversion from a negative int.
-        return NULL;
+        return nullptr;
     }
 
     if ((mDataPos+pad_size(len)) >= mDataPos && (mDataPos+pad_size(len)) <= mDataSize
@@ -1502,7 +1502,7 @@
         ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos);
         return data;
     }
-    return NULL;
+    return nullptr;
 }
 
 template<class T>
@@ -1943,7 +1943,7 @@
             return str;
         }
     }
-    return NULL;
+    return nullptr;
 }
 
 String8 Parcel::readString8() const
@@ -1974,7 +1974,7 @@
         return OK;
     }
     const char* str = (const char*)readInplace(size + 1);
-    if (str == NULL) {
+    if (str == nullptr) {
         return BAD_VALUE;
     }
     pArg->setTo(str, size);
@@ -2033,12 +2033,12 @@
     if (size >= 0 && size < INT32_MAX) {
         *outLen = size;
         const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t));
-        if (str != NULL) {
+        if (str != nullptr) {
             return str;
         }
     }
     *outLen = 0;
-    return NULL;
+    return nullptr;
 }
 
 status_t Parcel::readStrongBinder(sp<IBinder>* val) const
@@ -2100,13 +2100,13 @@
     int numFds, numInts;
     status_t err;
     err = readInt32(&numFds);
-    if (err != NO_ERROR) return 0;
+    if (err != NO_ERROR) return nullptr;
     err = readInt32(&numInts);
-    if (err != NO_ERROR) return 0;
+    if (err != NO_ERROR) return nullptr;
 
     native_handle* h = native_handle_create(numFds, numInts);
     if (!h) {
-        return 0;
+        return nullptr;
     }
 
     for (int i=0 ; err==NO_ERROR && i<numFds ; i++) {
@@ -2116,14 +2116,14 @@
                 close(h->data[j]);
             }
             native_handle_delete(h);
-            return 0;
+            return nullptr;
         }
     }
     err = read(h->data + numFds, sizeof(int)*numInts);
     if (err != NO_ERROR) {
         native_handle_close(h);
         native_handle_delete(h);
-        h = 0;
+        h = nullptr;
     }
     return h;
 }
@@ -2196,7 +2196,7 @@
     int fd = readFileDescriptor();
     if (fd == int(BAD_TYPE)) return BAD_VALUE;
 
-    void* ptr = ::mmap(NULL, len, isMutable ? PROT_READ | PROT_WRITE : PROT_READ,
+    void* ptr = ::mmap(nullptr, len, isMutable ? PROT_READ | PROT_WRITE : PROT_READ,
             MAP_SHARED, fd, 0);
     if (ptr == MAP_FAILED) return NO_MEMORY;
 
@@ -2218,10 +2218,10 @@
 
     // payload
     void const* const buf = this->readInplace(pad_size(len));
-    if (buf == NULL)
+    if (buf == nullptr)
         return BAD_VALUE;
 
-    int* fds = NULL;
+    int* fds = nullptr;
     if (fd_count) {
         fds = new (std::nothrow) int[fd_count];
         if (fds == nullptr) {
@@ -2312,7 +2312,7 @@
         ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list",
              this, DPOS);
     }
-    return NULL;
+    return nullptr;
 }
 
 void Parcel::closeFileDescriptors()
@@ -2521,7 +2521,7 @@
     ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos);
 
     free(mObjects);
-    mObjects = NULL;
+    mObjects = nullptr;
     mObjectsSize = mObjectsCapacity = 0;
     mNextObjectHint = 0;
     mHasFds = false;
@@ -2568,7 +2568,7 @@
             mError = NO_MEMORY;
             return NO_MEMORY;
         }
-        binder_size_t* objects = NULL;
+        binder_size_t* objects = nullptr;
 
         if (objectsSize) {
             objects = (binder_size_t*)calloc(objectsSize, sizeof(binder_size_t));
@@ -2595,7 +2595,7 @@
         }
         //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid());
         mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie);
-        mOwner = NULL;
+        mOwner = nullptr;
 
         LOG_ALLOC("Parcel %p: taking ownership of %zu capacity", this, desired);
         pthread_mutex_lock(&gParcelGlobalAllocSizeLock);
@@ -2668,7 +2668,7 @@
             return NO_MEMORY;
         }
 
-        if(!(mDataCapacity == 0 && mObjects == NULL
+        if(!(mDataCapacity == 0 && mObjects == nullptr
              && mObjectsCapacity == 0)) {
             ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired);
         }
@@ -2693,20 +2693,20 @@
 {
     LOG_ALLOC("Parcel %p: initState", this);
     mError = NO_ERROR;
-    mData = 0;
+    mData = nullptr;
     mDataSize = 0;
     mDataCapacity = 0;
     mDataPos = 0;
     ALOGV("initState Setting data size of %p to %zu", this, mDataSize);
     ALOGV("initState Setting data pos of %p to %zu", this, mDataPos);
-    mObjects = NULL;
+    mObjects = nullptr;
     mObjectsSize = 0;
     mObjectsCapacity = 0;
     mNextObjectHint = 0;
     mHasFds = false;
     mFdsKnown = true;
     mAllowFds = true;
-    mOwner = NULL;
+    mOwner = nullptr;
     mOpenAshmemSize = 0;
 
     // racing multiple init leads only to multiple identical write
@@ -2753,7 +2753,7 @@
 // --- Parcel::Blob ---
 
 Parcel::Blob::Blob() :
-        mFd(-1), mData(NULL), mSize(0), mMutable(false) {
+        mFd(-1), mData(nullptr), mSize(0), mMutable(false) {
 }
 
 Parcel::Blob::~Blob() {
@@ -2776,7 +2776,7 @@
 
 void Parcel::Blob::clear() {
     mFd = -1;
-    mData = NULL;
+    mData = nullptr;
     mSize = 0;
     mMutable = false;
 }
diff --git a/libs/binder/PermissionCache.cpp b/libs/binder/PermissionCache.cpp
index a503be8..a4c28ad 100644
--- a/libs/binder/PermissionCache.cpp
+++ b/libs/binder/PermissionCache.cpp
@@ -75,7 +75,7 @@
 }
 
 bool PermissionCache::checkCallingPermission(const String16& permission) {
-    return PermissionCache::checkCallingPermission(permission, NULL, NULL);
+    return PermissionCache::checkCallingPermission(permission, nullptr, nullptr);
 }
 
 bool PermissionCache::checkCallingPermission(
diff --git a/libs/binder/ProcessInfoService.cpp b/libs/binder/ProcessInfoService.cpp
index 8939d9c..5cb2033 100644
--- a/libs/binder/ProcessInfoService.cpp
+++ b/libs/binder/ProcessInfoService.cpp
@@ -36,7 +36,7 @@
 
     for (int i = 0; i < BINDER_ATTEMPT_LIMIT; i++) {
 
-        if (pis != NULL) {
+        if (pis != nullptr) {
             err = pis->getProcessStatesFromPids(length, /*in*/ pids, /*out*/ states);
             if (err == NO_ERROR) return NO_ERROR; // success
             if (IInterface::asBinder(pis)->isBinderAlive()) return err;
@@ -68,7 +68,7 @@
 
     for (int i = 0; i < BINDER_ATTEMPT_LIMIT; i++) {
 
-        if (pis != NULL) {
+        if (pis != nullptr) {
             err = pis->getProcessStatesAndOomScoresFromPids(length,
                     /*in*/ pids, /*out*/ states, /*out*/ scores);
             if (err == NO_ERROR) return NO_ERROR; // success
@@ -93,7 +93,7 @@
 
 void ProcessInfoService::updateBinderLocked() {
     const sp<IServiceManager> sm(defaultServiceManager());
-    if (sm != NULL) {
+    if (sm != nullptr) {
         const String16 name("processinfo");
         mProcessInfoService = interface_cast<IProcessInfoService>(sm->checkService(name));
     }
diff --git a/libs/binder/ProcessState.cpp b/libs/binder/ProcessState.cpp
index 8606129..6e7c427 100644
--- a/libs/binder/ProcessState.cpp
+++ b/libs/binder/ProcessState.cpp
@@ -68,7 +68,7 @@
 sp<ProcessState> ProcessState::self()
 {
     Mutex::Autolock _l(gProcessMutex);
-    if (gProcess != NULL) {
+    if (gProcess != nullptr) {
         return gProcess;
     }
     gProcess = new ProcessState("/dev/binder");
@@ -78,7 +78,7 @@
 sp<ProcessState> ProcessState::initWithDriver(const char* driver)
 {
     Mutex::Autolock _l(gProcessMutex);
-    if (gProcess != NULL) {
+    if (gProcess != nullptr) {
         // Allow for initWithDriver to be called repeatedly with the same
         // driver.
         if (!strcmp(gProcess->getDriverName().c_str(), driver)) {
@@ -122,18 +122,18 @@
 {
     mLock.lock();
     sp<IBinder> object(
-        mContexts.indexOfKey(name) >= 0 ? mContexts.valueFor(name) : NULL);
+        mContexts.indexOfKey(name) >= 0 ? mContexts.valueFor(name) : nullptr);
     mLock.unlock();
     
     //printf("Getting context object %s for %p\n", String8(name).string(), caller.get());
     
-    if (object != NULL) return object;
+    if (object != nullptr) return object;
 
     // Don't attempt to retrieve contexts if we manage them
     if (mManagesContexts) {
         ALOGE("getContextObject(%s) failed, but we manage the contexts!\n",
             String8(name).string());
-        return NULL;
+        return nullptr;
     }
     
     IPCThreadState* ipc = IPCThreadState::self();
@@ -150,7 +150,7 @@
     
     ipc->flushCommands();
     
-    if (object != NULL) setContextObject(object, name);
+    if (object != nullptr) setContextObject(object, name);
     return object;
 }
 
@@ -180,8 +180,8 @@
         if (result == 0) {
             mManagesContexts = true;
         } else if (result == -1) {
-            mBinderContextCheckFunc = NULL;
-            mBinderContextUserData = NULL;
+            mBinderContextCheckFunc = nullptr;
+            mBinderContextUserData = nullptr;
             ALOGE("Binder ioctl to become context manager failed: %s\n", strerror(errno));
         }
     }
@@ -207,7 +207,7 @@
 
     binder_node_debug_info info = {};
 
-    uintptr_t* end = buf ? buf + buf_count : NULL;
+    uintptr_t* end = buf ? buf + buf_count : nullptr;
     size_t count = 0;
 
     do {
@@ -233,10 +233,10 @@
     const size_t N=mHandleToObject.size();
     if (N <= (size_t)handle) {
         handle_entry e;
-        e.binder = NULL;
-        e.refs = NULL;
+        e.binder = nullptr;
+        e.refs = nullptr;
         status_t err = mHandleToObject.insertAt(e, N, handle+1-N);
-        if (err < NO_ERROR) return NULL;
+        if (err < NO_ERROR) return nullptr;
     }
     return &mHandleToObject.editItemAt(handle);
 }
@@ -249,12 +249,12 @@
 
     handle_entry* e = lookupHandleLocked(handle);
 
-    if (e != NULL) {
+    if (e != nullptr) {
         // We need to create a new BpBinder if there isn't currently one, OR we
         // are unable to acquire a weak reference on this current one.  See comment
         // in getWeakProxyForHandle() for more info about this.
         IBinder* b = e->binder;
-        if (b == NULL || !e->refs->attemptIncWeak(this)) {
+        if (b == nullptr || !e->refs->attemptIncWeak(this)) {
             if (handle == 0) {
                 // Special case for context manager...
                 // The context manager is the only object for which we create
@@ -277,9 +277,9 @@
 
                 Parcel data;
                 status_t status = IPCThreadState::self()->transact(
-                        0, IBinder::PING_TRANSACTION, data, NULL, 0);
+                        0, IBinder::PING_TRANSACTION, data, nullptr, 0);
                 if (status == DEAD_OBJECT)
-                   return NULL;
+                   return nullptr;
             }
 
             b = new BpBinder(handle); 
@@ -306,7 +306,7 @@
 
     handle_entry* e = lookupHandleLocked(handle);
 
-    if (e != NULL) {        
+    if (e != nullptr) {        
         // We need to create a new BpBinder if there isn't currently one, OR we
         // are unable to acquire a weak reference on this current one.  The
         // attemptIncWeak() is safe because we know the BpBinder destructor will always
@@ -315,7 +315,7 @@
         // releasing a reference on this BpBinder, and a new reference on its handle
         // arriving from the driver.
         IBinder* b = e->binder;
-        if (b == NULL || !e->refs->attemptIncWeak(this)) {
+        if (b == nullptr || !e->refs->attemptIncWeak(this)) {
             b = new BpBinder(handle);
             result = b;
             e->binder = b;
@@ -338,7 +338,7 @@
     // This handle may have already been replaced with a new BpBinder
     // (if someone failed the AttemptIncWeak() above); we don't want
     // to overwrite it.
-    if (e && e->binder == binder) e->binder = NULL;
+    if (e && e->binder == binder) e->binder = nullptr;
 }
 
 String8 ProcessState::makeBinderThreadName() {
@@ -416,14 +416,14 @@
     , mMaxThreads(DEFAULT_MAX_BINDER_THREADS)
     , mStarvationStartTimeMs(0)
     , mManagesContexts(false)
-    , mBinderContextCheckFunc(NULL)
-    , mBinderContextUserData(NULL)
+    , mBinderContextCheckFunc(nullptr)
+    , mBinderContextUserData(nullptr)
     , mThreadPoolStarted(false)
     , mThreadPoolSeq(1)
 {
     if (mDriverFD >= 0) {
         // mmap the binder, providing a chunk of virtual address space to receive transactions.
-        mVMStart = mmap(0, BINDER_VM_SIZE, PROT_READ, MAP_PRIVATE | MAP_NORESERVE, mDriverFD, 0);
+        mVMStart = mmap(nullptr, BINDER_VM_SIZE, PROT_READ, MAP_PRIVATE | MAP_NORESERVE, mDriverFD, 0);
         if (mVMStart == MAP_FAILED) {
             // *sigh*
             ALOGE("Using %s failed: unable to mmap transaction memory.\n", mDriverName.c_str());
diff --git a/libs/binder/Value.cpp b/libs/binder/Value.cpp
index 85cd739..2b263ed 100644
--- a/libs/binder/Value.cpp
+++ b/libs/binder/Value.cpp
@@ -143,12 +143,12 @@
 
 // ====================================================================
 
-Value::Value() : mContent(NULL)
+Value::Value() : mContent(nullptr)
 {
 }
 
 Value::Value(const Value& value)
-    : mContent(value.mContent ? value.mContent->clone() : NULL)
+    : mContent(value.mContent ? value.mContent->clone() : nullptr)
 {
 }
 
@@ -165,8 +165,8 @@
         return true;
     }
 
-    if ( (lhs.mContent == NULL)
-      || (rhs.mContent == NULL)
+    if ( (lhs.mContent == nullptr)
+      || (rhs.mContent == nullptr)
     ) {
         return false;
     }
@@ -186,25 +186,25 @@
         delete mContent;
         mContent = rhs.mContent
             ? rhs.mContent->clone()
-            : NULL;
+            : nullptr;
     }
     return *this;
 }
 
 bool Value::empty() const
 {
-    return mContent == NULL;
+    return mContent == nullptr;
 }
 
 void Value::clear()
 {
     delete mContent;
-    mContent = NULL;
+    mContent = nullptr;
 }
 
 int32_t Value::parcelType() const
 {
-    const void* t_info(mContent ? mContent->type_ptr() : NULL);
+    const void* t_info(mContent ? mContent->type_ptr() : nullptr);
 
     if (t_info == internal_type_ptr<bool>()) return VAL_BOOLEAN;
     if (t_info == internal_type_ptr<uint8_t>()) return VAL_BYTE;
@@ -381,7 +381,7 @@
     int32_t value_type = VAL_NULL;
 
     delete mContent;
-    mContent = NULL;
+    mContent = nullptr;
 
     RETURN_IF_FAILED(parcel->readInt32(&value_type));
 
diff --git a/libs/binder/tests/binderDriverInterfaceTest.cpp b/libs/binder/tests/binderDriverInterfaceTest.cpp
index 4f00bc1..77ebac8 100644
--- a/libs/binder/tests/binderDriverInterfaceTest.cpp
+++ b/libs/binder/tests/binderDriverInterfaceTest.cpp
@@ -36,8 +36,8 @@
 
             m_binderFd = open(BINDER_DEV_NAME, O_RDWR | O_NONBLOCK | O_CLOEXEC);
             ASSERT_GE(m_binderFd, 0);
-            m_buffer = mmap(NULL, 64*1024, PROT_READ, MAP_SHARED, m_binderFd, 0);
-            ASSERT_NE(m_buffer, (void *)NULL);
+            m_buffer = mmap(nullptr, 64*1024, PROT_READ, MAP_SHARED, m_binderFd, 0);
+            ASSERT_NE(m_buffer, (void *)nullptr);
             ret = ioctl(m_binderFd, BINDER_SET_MAX_THREADS, &max_threads);
             EXPECT_EQ(0, ret);
             EnterLooper();
@@ -156,23 +156,23 @@
 }
 
 TEST_F(BinderDriverInterfaceTest, WriteReadNull) {
-    binderTestIoctlErr1(BINDER_WRITE_READ, NULL, EFAULT);
+    binderTestIoctlErr1(BINDER_WRITE_READ, nullptr, EFAULT);
 }
 
 TEST_F(BinderDriverInterfaceTest, SetIdleTimeoutNull) {
-    binderTestIoctlErr2(BINDER_SET_IDLE_TIMEOUT, NULL, EFAULT, EINVAL);
+    binderTestIoctlErr2(BINDER_SET_IDLE_TIMEOUT, nullptr, EFAULT, EINVAL);
 }
 
 TEST_F(BinderDriverInterfaceTest, SetMaxThreadsNull) {
-    binderTestIoctlErr2(BINDER_SET_MAX_THREADS, NULL, EFAULT, EINVAL); /* TODO: don't accept EINVAL */
+    binderTestIoctlErr2(BINDER_SET_MAX_THREADS, nullptr, EFAULT, EINVAL); /* TODO: don't accept EINVAL */
 }
 
 TEST_F(BinderDriverInterfaceTest, SetIdlePriorityNull) {
-    binderTestIoctlErr2(BINDER_SET_IDLE_PRIORITY, NULL, EFAULT, EINVAL);
+    binderTestIoctlErr2(BINDER_SET_IDLE_PRIORITY, nullptr, EFAULT, EINVAL);
 }
 
 TEST_F(BinderDriverInterfaceTest, VersionNull) {
-    binderTestIoctlErr2(BINDER_VERSION, NULL, EFAULT, EINVAL); /* TODO: don't accept EINVAL */
+    binderTestIoctlErr2(BINDER_VERSION, nullptr, EFAULT, EINVAL); /* TODO: don't accept EINVAL */
 }
 
 TEST_F(BinderDriverInterfaceTest, SetIdleTimeoutNoTest) {
diff --git a/libs/binder/tests/binderLibTest.cpp b/libs/binder/tests/binderLibTest.cpp
index 1611e11..53072cc 100644
--- a/libs/binder/tests/binderLibTest.cpp
+++ b/libs/binder/tests/binderLibTest.cpp
@@ -88,7 +88,7 @@
         strpipefd1,
         usepoll,
         binderserversuffix,
-        NULL
+        nullptr
     };
 
     ret = pipe(pipefd);
@@ -123,7 +123,7 @@
         }
     }
     if (ret < 0) {
-        wait(NULL);
+        wait(nullptr);
         return ret;
     }
     return pid;
@@ -145,7 +145,7 @@
             sp<IServiceManager> sm = defaultServiceManager();
             //printf("%s: pid %d, get service\n", __func__, m_pid);
             m_server = sm->getService(binderLibTestServiceName);
-            ASSERT_TRUE(m_server != NULL);
+            ASSERT_TRUE(m_server != nullptr);
             //printf("%s: pid %d, get service done\n", __func__, m_pid);
         }
         virtual void TearDown() {
@@ -155,7 +155,7 @@
             pid_t pid;
 
             //printf("%s: pid %d\n", __func__, m_pid);
-            if (m_server != NULL) {
+            if (m_server != nullptr) {
                 ret = m_server->transact(BINDER_LIB_TEST_GET_STATUS_TRANSACTION, data, &reply);
                 EXPECT_EQ(0, ret);
                 ret = m_server->transact(BINDER_LIB_TEST_EXIT_TRANSACTION, data, &reply, TF_ONE_WAY);
@@ -192,9 +192,9 @@
             ret = m_server->transact(code, data, &reply);
             EXPECT_EQ(NO_ERROR, ret);
 
-            EXPECT_FALSE(binder != NULL);
+            EXPECT_FALSE(binder != nullptr);
             binder = reply.readStrongBinder();
-            EXPECT_TRUE(binder != NULL);
+            EXPECT_TRUE(binder != nullptr);
             ret = reply.readInt32(&id);
             EXPECT_EQ(NO_ERROR, ret);
             if (idPtr)
@@ -202,12 +202,12 @@
             return binder;
         }
 
-        sp<IBinder> addServer(int32_t *idPtr = NULL)
+        sp<IBinder> addServer(int32_t *idPtr = nullptr)
         {
             return addServerEtc(idPtr, BINDER_LIB_TEST_ADD_SERVER);
         }
 
-        sp<IBinder> addPollServer(int32_t *idPtr = NULL)
+        sp<IBinder> addPollServer(int32_t *idPtr = nullptr)
         {
             return addServerEtc(idPtr, BINDER_LIB_TEST_ADD_POLL_SERVER);
         }
@@ -274,8 +274,8 @@
         BinderLibTestEvent(void)
             : m_eventTriggered(false)
         {
-            pthread_mutex_init(&m_waitMutex, NULL);
-            pthread_cond_init(&m_waitCond, NULL);
+            pthread_mutex_init(&m_waitMutex, nullptr);
+            pthread_cond_init(&m_waitCond, nullptr);
         }
         int waitEvent(int timeout_s)
         {
@@ -315,7 +315,7 @@
     public:
         BinderLibTestCallBack()
             : m_result(NOT_ENOUGH_DATA)
-            , m_prev_end(NULL)
+            , m_prev_end(nullptr)
         {
         }
         status_t getResult(void)
@@ -413,7 +413,7 @@
     int32_t ptrsize;
     Parcel data, reply;
     sp<IBinder> server = addServer();
-    ASSERT_TRUE(server != NULL);
+    ASSERT_TRUE(server != nullptr);
     ret = server->transact(BINDER_LIB_TEST_GET_PTR_SIZE_TRANSACTION, data, &reply);
     EXPECT_EQ(NO_ERROR, ret);
     ret = reply.readInt32(&ptrsize);
@@ -436,7 +436,7 @@
         BinderLibTestBundle datai;
 
         server = addServer(&serverId[i]);
-        ASSERT_TRUE(server != NULL);
+        ASSERT_TRUE(server != nullptr);
         data.writeStrongBinder(server);
         data.writeInt32(BINDER_LIB_TEST_GET_ID_TRANSACTION);
         datai.appendTo(&data);
@@ -480,7 +480,7 @@
         BinderLibTestBundle datai2;
 
         server = addServer(&serverId[i]);
-        ASSERT_TRUE(server != NULL);
+        ASSERT_TRUE(server != nullptr);
         data.writeStrongBinder(server);
         data.writeInt32(BINDER_LIB_TEST_INDIRECT_TRANSACTION);
 
@@ -546,7 +546,7 @@
 TEST_F(BinderLibTest, AddServer)
 {
     sp<IBinder> server = addServer();
-    ASSERT_TRUE(server != NULL);
+    ASSERT_TRUE(server != nullptr);
 }
 
 TEST_F(BinderLibTest, DeathNotificationNoRefs)
@@ -557,7 +557,7 @@
 
     {
         sp<IBinder> binder = addServer();
-        ASSERT_TRUE(binder != NULL);
+        ASSERT_TRUE(binder != nullptr);
         ret = binder->linkToDeath(testDeathRecipient);
         EXPECT_EQ(NO_ERROR, ret);
     }
@@ -579,7 +579,7 @@
 
     {
         sp<IBinder> binder = addServer();
-        ASSERT_TRUE(binder != NULL);
+        ASSERT_TRUE(binder != nullptr);
         ret = binder->linkToDeath(testDeathRecipient);
         EXPECT_EQ(NO_ERROR, ret);
         wbinder = binder;
@@ -602,7 +602,7 @@
 
     {
         sp<IBinder> binder = addServer();
-        ASSERT_TRUE(binder != NULL);
+        ASSERT_TRUE(binder != nullptr);
         ret = binder->linkToDeath(testDeathRecipient);
         EXPECT_EQ(NO_ERROR, ret);
         sbinder = binder;
@@ -629,13 +629,13 @@
     sp<IBinder> passiveclient[clientcount];
 
     target = addServer();
-    ASSERT_TRUE(target != NULL);
+    ASSERT_TRUE(target != nullptr);
     for (int i = 0; i < clientcount; i++) {
         {
             Parcel data, reply;
 
             linkedclient[i] = addServer();
-            ASSERT_TRUE(linkedclient[i] != NULL);
+            ASSERT_TRUE(linkedclient[i] != nullptr);
             callBack[i] = new BinderLibTestCallBack();
             data.writeStrongBinder(target);
             data.writeStrongBinder(callBack[i]);
@@ -646,7 +646,7 @@
             Parcel data, reply;
 
             passiveclient[i] = addServer();
-            ASSERT_TRUE(passiveclient[i] != NULL);
+            ASSERT_TRUE(passiveclient[i] != nullptr);
             data.writeStrongBinder(target);
             ret = passiveclient[i]->transact(BINDER_LIB_TEST_ADD_STRONG_REF_TRANSACTION, data, &reply, TF_ONE_WAY);
             EXPECT_EQ(NO_ERROR, ret);
@@ -671,9 +671,9 @@
     status_t ret;
     sp<BinderLibTestCallBack> callback;
     sp<IBinder> target = addServer();
-    ASSERT_TRUE(target != NULL);
+    ASSERT_TRUE(target != nullptr);
     sp<IBinder> client = addServer();
-    ASSERT_TRUE(client != NULL);
+    ASSERT_TRUE(client != nullptr);
 
     sp<TestDeathRecipient> testDeathRecipient = new TestDeathRecipient();
 
@@ -767,12 +767,12 @@
     sp<IBinder> strong = new BBinder();
     wp<IBinder> weak = strong;
     sp<IBinder> strong_from_weak = weak.promote();
-    EXPECT_TRUE(strong != NULL);
+    EXPECT_TRUE(strong != nullptr);
     EXPECT_EQ(strong, strong_from_weak);
-    strong = NULL;
-    strong_from_weak = NULL;
+    strong = nullptr;
+    strong_from_weak = nullptr;
     strong_from_weak = weak.promote();
-    EXPECT_TRUE(strong_from_weak == NULL);
+    EXPECT_TRUE(strong_from_weak == nullptr);
 }
 
 TEST_F(BinderLibTest, PromoteRemote) {
@@ -781,8 +781,8 @@
     sp<IBinder> strong = new BBinder();
     sp<IBinder> server = addServer();
 
-    ASSERT_TRUE(server != NULL);
-    ASSERT_TRUE(strong != NULL);
+    ASSERT_TRUE(server != nullptr);
+    ASSERT_TRUE(strong != nullptr);
 
     ret = data.writeWeakBinder(strong);
     EXPECT_EQ(NO_ERROR, ret);
@@ -799,7 +799,7 @@
     EXPECT_EQ(NO_ERROR, ret);
 
     const flat_binder_object *fb = reply.readObject(false);
-    ASSERT_TRUE(fb != NULL);
+    ASSERT_TRUE(fb != nullptr);
     EXPECT_EQ(BINDER_TYPE_HANDLE, fb->hdr.type);
     EXPECT_EQ(m_server, ProcessState::self()->getStrongProxyForHandle(fb->handle));
     EXPECT_EQ((binder_uintptr_t)0, fb->cookie);
@@ -810,7 +810,7 @@
     status_t ret;
 
     sp<IBinder> server = addServer();
-    ASSERT_TRUE(server != NULL);
+    ASSERT_TRUE(server != nullptr);
 
     __u32 freedHandle;
     wp<IBinder> keepFreedBinder;
@@ -881,12 +881,12 @@
     data2.writeStrongBinder(callBack2);
     data2.writeInt32(0); // delay in us
 
-    ret = pollServer->transact(BINDER_LIB_TEST_DELAYED_CALL_BACK, data, NULL, TF_ONE_WAY);
+    ret = pollServer->transact(BINDER_LIB_TEST_DELAYED_CALL_BACK, data, nullptr, TF_ONE_WAY);
     EXPECT_EQ(NO_ERROR, ret);
 
     // The delay ensures that this second transaction will end up on the async_todo list
     // (for a single-threaded server)
-    ret = pollServer->transact(BINDER_LIB_TEST_DELAYED_CALL_BACK, data2, NULL, TF_ONE_WAY);
+    ret = pollServer->transact(BINDER_LIB_TEST_DELAYED_CALL_BACK, data2, nullptr, TF_ONE_WAY);
     EXPECT_EQ(NO_ERROR, ret);
 
     // The server will ensure that the two transactions are handled in the expected order;
@@ -909,10 +909,10 @@
             : m_id(id)
             , m_nextServerId(id + 1)
             , m_serverStartRequested(false)
-            , m_callback(NULL)
+            , m_callback(nullptr)
         {
-            pthread_mutex_init(&m_serverWaitMutex, NULL);
-            pthread_cond_init(&m_serverWaitCond, NULL);
+            pthread_mutex_init(&m_serverWaitMutex, nullptr);
+            pthread_cond_init(&m_serverWaitCond, nullptr);
         }
         ~BinderLibTestService()
         {
@@ -920,11 +920,11 @@
         }
 
         void processPendingCall() {
-            if (m_callback != NULL) {
+            if (m_callback != nullptr) {
                 Parcel data;
                 data.writeInt32(NO_ERROR);
                 m_callback->transact(BINDER_LIB_TEST_CALL_BACK, data, nullptr, TF_ONE_WAY);
-                m_callback = NULL;
+                m_callback = nullptr;
             }
         }
 
@@ -943,7 +943,7 @@
                 sp<IBinder> binder;
                 id = data.readInt32();
                 binder = data.readStrongBinder();
-                if (binder == NULL) {
+                if (binder == nullptr) {
                     return BAD_VALUE;
                 }
 
@@ -993,7 +993,7 @@
                     } else {
                         reply->writeStrongBinder(m_serverStarted);
                         reply->writeInt32(serverid);
-                        m_serverStarted = NULL;
+                        m_serverStarted = nullptr;
                         ret = NO_ERROR;
                     }
                 } else if (ret >= 0) {
@@ -1008,7 +1008,7 @@
             case BINDER_LIB_TEST_DELAYED_CALL_BACK: {
                 // Note: this transaction is only designed for use with a
                 // poll() server. See comments around epoll_wait().
-                if (m_callback != NULL) {
+                if (m_callback != nullptr) {
                     // A callback was already pending; this means that
                     // we received a second call while still processing
                     // the first one. Fail the test.
@@ -1016,7 +1016,7 @@
                     Parcel data2;
                     data2.writeInt32(UNKNOWN_ERROR);
 
-                    callback->transact(BINDER_LIB_TEST_CALL_BACK, data2, NULL, TF_ONE_WAY);
+                    callback->transact(BINDER_LIB_TEST_CALL_BACK, data2, nullptr, TF_ONE_WAY);
                 } else {
                     m_callback = data.readStrongBinder();
                     int32_t delayUs = data.readInt32();
@@ -1045,7 +1045,7 @@
                 Parcel data2, reply2;
                 sp<IBinder> binder;
                 binder = data.readStrongBinder();
-                if (binder == NULL) {
+                if (binder == nullptr) {
                     return BAD_VALUE;
                 }
                 data2.writeInt32(NO_ERROR);
@@ -1068,7 +1068,7 @@
                 reply->writeInt32(count);
                 for (int i = 0; i < count; i++) {
                     binder = data.readStrongBinder();
-                    if (binder == NULL) {
+                    if (binder == nullptr) {
                         return BAD_VALUE;
                     }
                     indirect_code = data.readInt32();
@@ -1101,11 +1101,11 @@
                 sp<IBinder> callback;
 
                 target = data.readStrongBinder();
-                if (target == NULL) {
+                if (target == nullptr) {
                     return BAD_VALUE;
                 }
                 callback = data.readStrongBinder();
-                if (callback == NULL) {
+                if (callback == nullptr) {
                     return BAD_VALUE;
                 }
                 ret = target->linkToDeath(testDeathRecipient);
@@ -1130,7 +1130,7 @@
                     return ret;
                 }
                 buf = data.readInplace(size);
-                if (buf == NULL) {
+                if (buf == nullptr) {
                     return BAD_VALUE;
                 }
                 ret = write(fd, buf, size);
@@ -1147,7 +1147,7 @@
                 sp<IBinder> server = sm->getService(binderLibTestServiceName);
 
                 weak = data.readWeakBinder();
-                if (weak == NULL) {
+                if (weak == nullptr) {
                     return BAD_VALUE;
                 }
                 strong = weak.promote();
@@ -1156,7 +1156,7 @@
                 if (ret != NO_ERROR)
                     exit(EXIT_FAILURE);
 
-                if (strong == NULL) {
+                if (strong == nullptr) {
                     reply->setError(1);
                 }
                 return NO_ERROR;
@@ -1165,7 +1165,7 @@
                 alarm(10);
                 return NO_ERROR;
             case BINDER_LIB_TEST_EXIT_TRANSACTION:
-                while (wait(NULL) != -1 || errno != ECHILD)
+                while (wait(nullptr) != -1 || errno != ECHILD)
                     ;
                 exit(EXIT_SUCCESS);
             case BINDER_LIB_TEST_CREATE_BINDER_TRANSACTION: {
diff --git a/libs/binder/tests/binderThroughputTest.cpp b/libs/binder/tests/binderThroughputTest.cpp
index 455f2c4..da7fc39 100644
--- a/libs/binder/tests/binderThroughputTest.cpp
+++ b/libs/binder/tests/binderThroughputTest.cpp
@@ -380,7 +380,7 @@
             // Caller specified the max latency in microseconds.
             // No need to run training round in this case.
             if (atoi(argv[i+1]) > 0) {
-                max_time_bucket = strtoull(argv[i+1], (char **)NULL, 10) * 1000;
+                max_time_bucket = strtoull(argv[i+1], (char **)nullptr, 10) * 1000;
                 i++;
             } else {
                 cout << "Max latency -m must be positive." << endl;
diff --git a/libs/binder/tests/schd-dbg.cpp b/libs/binder/tests/schd-dbg.cpp
index 13f03b1..6cf7f36 100644
--- a/libs/binder/tests/schd-dbg.cpp
+++ b/libs/binder/tests/schd-dbg.cpp
@@ -295,7 +295,7 @@
 
   no_inherent += reply.readInt32();
   no_sync += reply.readInt32();
-  return 0;
+  return nullptr;
 }
 
 // create a fifo thread to transact and wait it to finished